I've noticed that all the diagrams have the floor mounted right on the steel trailer frame. If I do this how do I attach the sides to the floor. I saw some diagrams on other builds that showed people using a floor made with 2x2 wood frames under the floor and on top of the trailer frame. The floor completely built separately with floor on top of wooden frame then attached to the metal trailer frame. Also can I over hang the wood over the sides of the metal frame a couple inches to maintain my interior width of 60 inches. I'm planning on 1 1/2 inch walls so I'll need 3 more inches width.
Art