Malcolm Webb wrote on Wed, Jan 30, 2013 01:29 PM UTC:
I like the basic idea, and I appreciate the diagram you added to the previous comment illustrating the Bishop move (and presumably the Queen move also).
I like the innovation of the Queen's ability to give check to the King if it is on the same level and unaccompanied. This new ability is necessary to keep the game moving, and makes the Queen much more important than in 2D chess.
I presume the King moves in all 26 directions. That being so, I expect that forcing checkmate would be quite difficult if you had lost your Queen.