diff --git a/tycho/cc/mapmodel.cc b/tycho/cc/mapmodel.cc
index 59a13e3..e25607b 100644
--- a/tycho/cc/mapmodel.cc
+++ b/tycho/cc/mapmodel.cc
@@ -17,26 +17,6 @@ ProjectModel::Type MapModel::type() const
    return ProjectModel::Map;
 }
 
-QAbstractItemModel const *MapModel::getAbstract() const
-{
-   return this;
-}
-
-QAbstractItemModel *MapModel::getAbstract()
-{
-   return this;
-}
-
-MapModel const *MapModel::getMap() const
-{
-   return this;
-}
-
-MapModel *MapModel::getMap()
-{
-   return this;
-}
-
 bool MapModel::isDirty() const
 {
    return AbstractMapModel::isDirty();
diff --git a/tycho/cc/mapprops.cc b/tycho/cc/mapprops.cc
index d33d011..6a4e0de 100644
--- a/tycho/cc/mapprops.cc
+++ b/tycho/cc/mapprops.cc
@@ -1,6 +1,6 @@
 #include "tycho.h"
 
-MapProps::MapProps(MapModel *_mapModel, QWidget *parent) :
+MapProps::MapProps(std::weak_ptr<MapModel> _mapModel, QWidget *parent) :
    QDialog(parent),
    mapModel(_mapModel)
 {
diff --git a/tycho/cc/mapview.cc b/tycho/cc/mapview.cc
index 3d22db9..c7617e8 100644
--- a/tycho/cc/mapview.cc
+++ b/tycho/cc/mapview.cc
@@ -1,7 +1,8 @@
 #include "tycho.h"
 
-MapView::MapView(MapModel *mapModel, QWidget *parent) :
-   QWidget(parent)
+MapView::MapView(std::weak_ptr<MapModel> _mapModel, QWidget *parent) :
+   QWidget(parent),
+   mapModel(_mapModel)
 {
    setupUi(this);
 
diff --git a/tycho/cc/menu.cc b/tycho/cc/menu.cc
index ae82e2a..52024fd 100644
--- a/tycho/cc/menu.cc
+++ b/tycho/cc/menu.cc
@@ -42,7 +42,7 @@ void Menu::mapOpen()
    if(!fname.isEmpty()) {
       QScopedPointer proj{new Project(new MapModel)};
 
-      if(proj->model->open(fname)) {
+      if(proj->getModel()->open(fname)) {
          addProject(proj.take());
       }
    }
@@ -98,8 +98,8 @@ void Menu::openMapProperties()
 {
    auto proj = activeProject();
 
-   if(proj && proj->model->type() == ProjectModel::Map) {
-      MapProps props{proj->model->getMap(), proj};
+   if(proj && proj->getModel()->type() == ProjectModel::Map) {
+      MapProps props{proj->getMapModel(), proj};
       props.exec();
    }
 }
diff --git a/tycho/cc/project.cc b/tycho/cc/project.cc
index 06daab4..bf88258 100644
--- a/tycho/cc/project.cc
+++ b/tycho/cc/project.cc
@@ -11,7 +11,7 @@ Project::Project(ProjectModel *_model, QWidget *parent) :
    setWidget(widget);
    setAttribute(Qt::WA_DeleteOnClose);
 
-   listView->setModel(model->getAbstract());
+   listView->setModel(dynamic_cast<QAbstractItemModel *>(model.get()));
 
    dbgPrintFunc();
 }
@@ -21,6 +21,16 @@ Project::~Project()
    dbgPrintFunc();
 }
 
+std::shared_ptr<ProjectModel> Project::getModel()
+{
+   return model;
+}
+
+std::shared_ptr<MapModel> Project::getMapModel()
+{
+   return std::dynamic_pointer_cast<MapModel>(model);
+}
+
 void Project::closeEvent(QCloseEvent *event)
 {
    if(model->isDirty()) {
diff --git a/tycho/cc/tycho.h b/tycho/cc/tycho.h
index 65881bb..7ae7592 100644
--- a/tycho/cc/tycho.h
+++ b/tycho/cc/tycho.h
@@ -3,6 +3,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <iostream>
+#include <memory>
 #include <vector>
 
 #include <QApplication>
@@ -29,42 +30,6 @@ class MapProps;
 class MapView;
 class Menu;
 class Project;
-class ProjectModel;
-
-class MapProps : public QDialog, private Ui::MapProps
-{
-   Q_OBJECT
-
-public:
-   explicit MapProps(MapModel *mapModel, QWidget *parent = nullptr);
-   ~MapProps();
-
-private:
-   MapModel *mapModel;
-};
-
-class MapView : public QWidget, private Ui::MapView
-{
-   Q_OBJECT
-
-public:
-   explicit MapView(MapModel *mapModel, QWidget *parent = nullptr);
-   ~MapView();
-};
-
-class Project : public QMdiSubWindow, private Ui::Project
-{
-   Q_OBJECT
-
-public:
-   explicit Project(ProjectModel *model, QWidget *parent = nullptr);
-   ~Project();
-
-   QSharedPointer<ProjectModel> model;
-
-protected:
-   void closeEvent(QCloseEvent *event) override;
-};
 
 class ProjectModel
 {
@@ -78,18 +43,13 @@ public:
 
    virtual Type type() const = 0;
 
-   virtual QAbstractItemModel const *getAbstract() const = 0;
-   virtual QAbstractItemModel       *getAbstract()       = 0;
-   virtual MapModel const *getMap() const = 0;
-   virtual MapModel       *getMap()       = 0;
-
    virtual bool isDirty() const = 0;
    virtual bool open(QString const &path) = 0;
    virtual bool save() const = 0;
    virtual bool saveAs(QString const &path) const = 0;
 };
 
-class MapModel final : private AbstractMapModel, public ProjectModel
+class MapModel final : public AbstractMapModel, public ProjectModel
 {
    Q_OBJECT
 
@@ -99,11 +59,6 @@ public:
 
    ProjectModel::Type type() const override;
 
-   QAbstractItemModel const *getAbstract() const override;
-   QAbstractItemModel       *getAbstract()       override;
-   MapModel const *getMap() const override;
-   MapModel       *getMap()       override;
-
    bool isDirty() const override;
    bool open(QString const &path) override;
    bool save() const override;
@@ -114,7 +69,33 @@ private:
       const override;
 };
 
-class Menu : public QMainWindow, private Ui::Menu
+class MapProps final : public QDialog, private Ui::MapProps
+{
+   Q_OBJECT
+
+public:
+   explicit MapProps(std::weak_ptr<MapModel> mapModel,
+                     QWidget *parent = nullptr);
+   ~MapProps();
+
+private:
+   std::weak_ptr<MapModel> mapModel;
+};
+
+class MapView final : public QWidget, private Ui::MapView
+{
+   Q_OBJECT
+
+public:
+   explicit MapView(std::weak_ptr<MapModel> mapModel,
+                    QWidget *parent = nullptr);
+   ~MapView();
+
+private:
+   std::weak_ptr<MapModel> mapModel;
+};
+
+class Menu final : public QMainWindow, private Ui::Menu
 {
    Q_OBJECT
 
@@ -140,6 +121,25 @@ private:
    void addProject(Project *proj);
 };
 
+class Project final : public QMdiSubWindow, private Ui::Project
+{
+   Q_OBJECT
+
+public:
+   explicit Project(ProjectModel *model, QWidget *parent = nullptr);
+   ~Project();
+
+   std::shared_ptr<ProjectModel>       getModel();
+   std::shared_ptr<MapModel>           getMapModel();
+   std::shared_ptr<QAbstractItemModel> getAbstractModel();
+
+protected:
+   void closeEvent(QCloseEvent *event) override;
+
+private:
+   std::shared_ptr<ProjectModel> model;
+};
+
 template<typename... VA>
 static inline void dbgPrint([[maybe_unused]] char const *fmt,
                             [[maybe_unused]] VA &&...va)