One could use functions from OGRE to do the rendering along side the engine, yes?
Also, what is Nebula Device?
Also(#2), I checked out Cube 2 and seems like a solid engine. During my play through of the packaged game, the only problems I had were the movement was too fast, the lack of visuals on what weapons I had, and the annoying tails of certain enemies sticking through walls
Nothing some code tweaks can't fix though.
So now I do believe this project will soon turn into a Cube 2 engine rewrite or add on...