Thanks and the steel frame is a good call, and something I might do in future. I have a small wooden frame top and bottom to spread the load as well as the plywood. It is a small trailer though so I am not too worried. The axle is a torsion one so I am going to put in a steel spacer and remount the axle three inches lower. Hoping this gives me the height I am looking for. I may change out the axle in future for something else as spring setups are so much easier to work with, I can add shocks etc.I would have welded in a new steel frame around the window opening where you cut the ribs. I guess with plywood on such a small trailer it will not matter. Nice job. Are you going to put the leafs on top of the axle?
Not mine, but something like this: