Alright, this is annoying the crap out of me -- I can't figure out how to create doors. Every time I attempt to make a thin(-ish) wall, it says the box is empty, or it goes to the grid, making the brush too big.
Also, how does one place a entity on top of an entity(A T.V. on top of a table)? And, one more thing, every time I put an entity in, it goes through the wall or floor. When I try to move this entity out, it only moves to the grid, there's no middle ground. Is there a way to put an entity in that doesn't go through the brushes?

