diff --git a/gui/gui.cmake b/gui/gui.cmake
index fb7f2db4..961d498a 100644
--- a/gui/gui.cmake
+++ b/gui/gui.cmake
@@ -21,10 +21,6 @@ set(GENERATED_MOC_FILES
     ${CMAKE_CURRENT_BINARY_DIR}/generated/moc_designwidget.cc
 )
 
-set(UI_SOURCES
-    gui/mainwindow.ui
-)
-qt5_wrap_ui_custom(GENERATED_UI_HEADERS ${UI_SOURCES})
 qt5_add_resources_custom(GUI_RESOURCE_FILES gui/nextpnr.qrc)
 
 aux_source_directory(gui/ GUI_ALL_SOURCE_FILES)
diff --git a/gui/mainwindow.cc b/gui/mainwindow.cc
index bd38cc40..76addbba 100644
--- a/gui/mainwindow.cc
+++ b/gui/mainwindow.cc
@@ -1,34 +1,115 @@
 #include "mainwindow.h"
+#include <QAction>
+#include <QGridLayout>
+#include <QIcon>
+#include <QMenu>
+#include <QMenuBar>
+#include <QSplitter>
+#include <QStatusBar>
+#include <QToolBar>
 #include "designwidget.h"
 #include "fpgaviewwidget.h"
 #include "pythontab.h"
-#include "ui_mainwindow.h"
 
 MainWindow::MainWindow(Design *_design, QWidget *parent)
-        : QMainWindow(parent), ui(new Ui::MainWindow), design(_design)
+        : QMainWindow(parent), design(_design)
 {
-    ui->setupUi(this);
     std::string title = "nextpnr-ice40 - " + design->chip.getChipName();
     setWindowTitle(title.c_str());
+    setObjectName(QStringLiteral("MainWindow"));
+    resize(1024, 768);
 
-    ui->splitter->addWidget(new FPGAViewWidget());
+    createMenusAndBars();
+
+    QWidget *centralWidget = new QWidget(this);
+
+    QGridLayout *gridLayout = new QGridLayout(centralWidget);
+    gridLayout->setSpacing(6);
+    gridLayout->setContentsMargins(11, 11, 11, 11);
+
+    QSplitter *splitter_h = new QSplitter(Qt::Horizontal, centralWidget);
+    QSplitter *splitter_v = new QSplitter(Qt::Vertical, splitter_h);
+    splitter_h->addWidget(splitter_v);
+
+    gridLayout->addWidget(splitter_h, 0, 0, 1, 1);
+
+    setCentralWidget(centralWidget);
 
     DesignWidget *designview = new DesignWidget(design);
     designview->setMinimumWidth(300);
     designview->setMaximumWidth(300);
+    splitter_h->addWidget(designview);
 
     connect(designview, SIGNAL(info(std::string)), this,
             SLOT(writeInfo(std::string)));
 
-    ui->splitter_2->addWidget(designview);
-
-    tabWidget = new QTabWidget();
+    QTabWidget *tabWidget = new QTabWidget();
     tabWidget->addTab(new PythonTab(), "Python");
     info = new InfoTab();
     tabWidget->addTab(info, "Info");
-    ui->splitter->addWidget(tabWidget);
+    splitter_v->addWidget(new FPGAViewWidget());
+    splitter_v->addWidget(tabWidget);
 }
 
-MainWindow::~MainWindow() { delete ui; }
+MainWindow::~MainWindow() {}
 
 void MainWindow::writeInfo(std::string text) { info->info(text); }
+
+void MainWindow::createMenusAndBars()
+{
+    QAction *actionNew = new QAction("New", this);
+    QIcon icon;
+    icon.addFile(QStringLiteral(":/icons/resources/new.png"));
+    actionNew->setIcon(icon);
+
+    QAction *actionOpen = new QAction("Open", this);
+    QIcon icon1;
+    icon1.addFile(QStringLiteral(":/icons/resources/open.png"));
+    actionOpen->setIcon(icon1);
+
+    QAction *actionSave = new QAction("Save", this);
+    QIcon icon2;
+    icon2.addFile(QStringLiteral(":/icons/resources/save.png"));
+    actionSave->setIcon(icon2);
+
+    QAction *actionSave_as = new QAction("Save as ...", this);
+
+    QAction *actionClose = new QAction("Close", this);
+
+    QAction *actionExit = new QAction("Exit", this);
+
+    QIcon icon3;
+    icon3.addFile(QStringLiteral(":/icons/resources/exit.png"));
+    actionExit->setIcon(icon3);
+
+    QAction *actionAbout = new QAction("About", this);
+
+    QMenuBar *menuBar = new QMenuBar();
+    menuBar->setGeometry(QRect(0, 0, 1024, 27));
+    QMenu *menu_File = new QMenu("&File", menuBar);
+    QMenu *menu_Help = new QMenu("&Help", menuBar);
+    menuBar->addAction(menu_File->menuAction());
+    menuBar->addAction(menu_Help->menuAction());
+    setMenuBar(menuBar);
+
+    QToolBar *mainToolBar = new QToolBar();
+    addToolBar(Qt::TopToolBarArea, mainToolBar);
+
+    QStatusBar *statusBar = new QStatusBar();
+    setStatusBar(statusBar);
+
+    menu_File->addAction(actionNew);
+    menu_File->addAction(actionOpen);
+    menu_File->addAction(actionSave);
+    menu_File->addAction(actionSave_as);
+    menu_File->addAction(actionClose);
+    menu_File->addSeparator();
+    menu_File->addAction(actionExit);
+    menu_Help->addAction(actionAbout);
+
+    mainToolBar->addAction(actionNew);
+    mainToolBar->addAction(actionOpen);
+    mainToolBar->addAction(actionSave);
+
+    connect(actionExit, SIGNAL(triggered()), this, SLOT(close()));
+}
diff --git a/gui/mainwindow.h b/gui/mainwindow.h
index 40bb98ef..6516a986 100644
--- a/gui/mainwindow.h
+++ b/gui/mainwindow.h
@@ -10,10 +10,6 @@
 // FIXME
 USING_NEXTPNR_NAMESPACE
 
-namespace Ui {
-class MainWindow;
-}
-
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
@@ -23,14 +19,14 @@ class MainWindow : public QMainWindow
     ~MainWindow();
     Design *getDesign() { return design; }
 
+  private:
+    void createMenusAndBars();
+
   private Q_SLOTS:
     void writeInfo(std::string text);
 
   private:
-    Ui::MainWindow *ui;
     Design *design;
-
-    QTabWidget *tabWidget;
     InfoTab *info;
 };
 
diff --git a/gui/mainwindow.ui b/gui/mainwindow.ui
deleted file mode 100644
index 7260c7ea..00000000
--- a/gui/mainwindow.ui
+++ /dev/null
@@ -1,153 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>MainWindow</class>
- <widget class="QMainWindow" name="MainWindow">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>969</width>
-    <height>629</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>nextpnr</string>
-  </property>
-  <widget class="QWidget" name="centralWidget">
-   <layout class="QGridLayout" name="gridLayout">
-    <item row="0" column="0">
-     <widget class="QSplitter" name="splitter_3">
-      <property name="orientation">
-       <enum>Qt::Horizontal</enum>
-      </property>
-      <widget class="QSplitter" name="splitter">
-       <property name="orientation">
-        <enum>Qt::Vertical</enum>
-       </property>
-      </widget>
-      <widget class="QSplitter" name="splitter_2">
-       <property name="orientation">
-        <enum>Qt::Vertical</enum>
-       </property>       
-      </widget>
-     </widget>
-    </item>
-   </layout>
-  </widget>
-  <widget class="QMenuBar" name="menuBar">
-   <property name="geometry">
-    <rect>
-     <x>0</x>
-     <y>0</y>
-     <width>969</width>
-     <height>27</height>
-    </rect>
-   </property>
-   <widget class="QMenu" name="menu_File">
-    <property name="title">
-     <string>&amp;File</string>
-    </property>
-    <addaction name="actionNew"/>
-    <addaction name="actionOpen"/>
-    <addaction name="actionSave"/>
-    <addaction name="actionSave_as"/>
-    <addaction name="actionClose"/>
-    <addaction name="separator"/>
-    <addaction name="actionExit"/>
-   </widget>
-   <widget class="QMenu" name="menu_Help">
-    <property name="title">
-     <string>&amp;Help</string>
-    </property>
-    <addaction name="actionAbout"/>
-   </widget>
-   <addaction name="menu_File"/>
-   <addaction name="menu_Help"/>
-  </widget>
-  <widget class="QToolBar" name="mainToolBar">
-   <attribute name="toolBarArea">
-    <enum>TopToolBarArea</enum>
-   </attribute>
-   <attribute name="toolBarBreak">
-    <bool>false</bool>
-   </attribute>
-   <addaction name="actionNew"/>
-   <addaction name="actionOpen"/>
-   <addaction name="actionSave"/>
-  </widget>
-  <widget class="QStatusBar" name="statusBar"/>
-  <action name="actionNew">
-   <property name="icon">
-    <iconset resource="nextpnr.qrc">
-     <normaloff>:/icons/resources/new.png</normaloff>:/icons/resources/new.png</iconset>
-   </property>
-   <property name="text">
-    <string>New</string>
-   </property>
-  </action>
-  <action name="actionOpen">
-   <property name="icon">
-    <iconset resource="nextpnr.qrc">
-     <normaloff>:/icons/resources/open.png</normaloff>:/icons/resources/open.png</iconset>
-   </property>
-   <property name="text">
-    <string>Open</string>
-   </property>
-  </action>
-  <action name="actionSave">
-   <property name="icon">
-    <iconset resource="nextpnr.qrc">
-     <normaloff>:/icons/resources/save.png</normaloff>:/icons/resources/save.png</iconset>
-   </property>
-   <property name="text">
-    <string>Save</string>
-   </property>
-  </action>
-  <action name="actionSave_as">
-   <property name="text">
-    <string>Save as ...</string>
-   </property>
-  </action>
-  <action name="actionClose">
-   <property name="text">
-    <string>Close</string>
-   </property>
-  </action>
-  <action name="actionExit">
-   <property name="icon">
-    <iconset resource="nextpnr.qrc">
-     <normaloff>:/icons/resources/exit.png</normaloff>:/icons/resources/exit.png</iconset>
-   </property>
-   <property name="text">
-    <string>Exit</string>
-   </property>
-  </action>
-  <action name="actionAbout">
-   <property name="text">
-    <string>About</string>
-   </property>
-  </action>
- </widget>
- <layoutdefault spacing="6" margin="11"/>
- <resources>
-  <include location="nextpnr.qrc"/>
- </resources>
- <connections>
-  <connection>
-   <sender>actionExit</sender>
-   <signal>triggered()</signal>
-   <receiver>MainWindow</receiver>
-   <slot>close()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>-1</x>
-     <y>-1</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>484</x>
-     <y>314</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
-</ui>