That doesn't sound like it should work -- dematerializing is itself an energy-expensive process. UU-matter is already primed to be shaped into something else (hence why Steve can use just a regular old crafting table to produce stuff out of it), but regular matter isn't.
Well, to me it seems like creating matter from nothing would be more energy consuming than using existing matter in any form...
But it might just not be worth implementing that since most people might not want to destroy the target area.