Advanced further with the application development: added window drawing/redrawing functionality, undo/redo commands, possibility to change the object view (left, right, top, bottom, axonometric, front, back). At this moment the application is stable and working properly.
From this moment I can say that the application development can start. The next development steps will be to refactor the application and after that start adding new functionalities at the application skeleton.
I am starting now to reevaluate the tasks, the development schedule and deadlines and add the source codes to Sourceforge.