Indead, very interesting concept!
Do you still use with one fix point, too?
But level design is just sooo not for me! I have some interesting ideas, but it's just so horrible to drag those blocks into place.. :P
You should use World snap with values of 32, 64 or 128.
Not sure, if World snap is the right word, I mean the restrictions that snap your blocks and vertices to the grid.
