Another part of the source code is now as ready as it can be. I think the GUI class is looking pretty good now. I don't even hope for good looking graphics at this point, I'm happy that basic drawing functions are done. The gameview still can't update itself so it looks a mess and even messages aren't shown and need to check out n+1 things related to drawing functions, but I'm still happy that something was done and finished finally. It may not sound very exciting, but for me it surely is, having spent so much time on this project.
Next I'm going to concentrate on that gameview drawing. The gameview now has clearly set areas so it should be easy to check out them one by one.