Once this project will become more popular, I think you will have enough income to dedicate only to programming this wonderful software. I discovered this project by mistake, was just a short mention into a forum, nowhere else I found references before. Definitely this project needs more marketing because have great potential.
I also intend to build a CNC machine with a 4th rotating axis (wood lathe) and the main head to be 5axis driven. Maybe my first machine will be only 3axis and the 4th for lathe, but second one certainly will be a 5axis one. If you need 5axis algorithms you can check the http://www.5axismaker.com project. It is a Rhino-Grasshopper definition that can generate 5axis gcode for CNC machines.