Question, Do flying units w/ 0 speed move if stacked at different hights?

just as the question stated. This to help me relize the possibility of an idea that hit me while i was lifegaurding at an indoor pool this morning having my brain melt watching a 75 year old man with saggy boobs flop back and forth the pool.

That aside the idea is, if i could figure out how to uv map and animate, could i make buildings, and use flying to simulate not only onestory buildings with walls, but 2 story buildings using walls, that fly over walls, and floor, all of which u use the hide ability of ne(day and night modified) when a unit steps inside, along with aloc so that it cant be selected... well none of it would be possible if u cant stack air units cause that would be how the roof would go on... but can u? plz dont anyone go run off with this idea if it is possible and not give me credit.

Air units stack. I think. Without 0 collision size though, I doubt that they will. How will they be able to walk on it anyway? Or will it just be the load ability?

... Air units move away from eachother when they're standing still. I do however not know if they do when they have 0 movement speed, why don't you try?

oh.... very weird, but it will work... if i can learn how to skin! heres what happens. u turn collision to 0, and base movement 2 0. guess what! in game, the selection circles spread out! (so on minimap of small map (64x64) i saw 3 little white squares, even though they were stacked EXACTLY on top of each other. but they dont move. u know why? cause if u put base movement speed at 0, there is no move command :P YAY!!!