http://www.youtube.com/watch?v=WbsJ0TMFp_s that link should help you with the crane. but the walls just secure all sides with teleporters against the wall and then put a door (partly through it) on the side of the box and then tap a twice on the box and wait till it stops moving and it should be in the wall.
ok ill try to find u a link ForgeHub - Merging Immovable Objects with Map Geometry- Halo 3 Maps there. a nice little tutorial for ya. its on forge hub too. if you have any more forge questions, just check at tutorials. they probably have what you are looking for. oh by the way u should definitely get a better signature lol
there are some threads (or atleast used to be) that let u submit all u want in a sig and they make a pic for u.