The datamanagement code is nearly 100% completed, so I can then focus on the game design. I am currently writing the game design document, and I hope I will be finished with that soon.
And I have also started on the GUI design. The design is inspired from the Linux Gnome theme. So it will have menus at the top, and window management on the bottom. In the middle, you will be able to see the development of your company's HQ, with 3D renders. The renders will not be realtime 3D renders (too keep the system requirements and a minimum), just prerenders, rendered with blender and raytracing.