i've been trying to add a safe to my Megaton house through the render window,but when i get it in,and also get it at the right height,it's either not there or i've not managed to get the height right.my house hasn't been decorated and is bare.i also tried to add a wall safe,loaded up fo3 and it wasn't at the right height,so i moved it down,and when i load up fo3 again,it had totally disappeared,HELP!