I found out about your project yesterday. First i only took a look at version 1.0 and with ubuntu as base system it was all right.
But as i read that the newer versions will require kubuntu with kde desktop this project nearly died for me.
Why do you what to use kde? kde is only wolfing down system resources... ubuntu is fine, but xubuntu would even be nicer, because you don't need to spend so many resources on a window manager you don't need.
As bobpaul allready said, it is possible to run more than one X server with 3d support. One way is as bobpaul said with sudo, another way is simply adding
to your xorg.conf
Hope this will change...