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Frame
The frame sides are 2"x 3" 16 gage. Yeah I know 16 gage is thin, but the tall shape makes it strong. The cross members are 2x2 16 gage. The tongue area is extended to accommodate...stuff. I had a trailer with a tortion style axle so I cut it off wire wheeled the rust off. I powder coat almost everything I build that is steel. However this project is built like a prototype so I will likely be cutting and welding on this frame after the trailer is together so I painted it with oil based rustoleum with a brush. When I am sure I am done cutting and welding on this frame I will sand down the tongue and spray it with a gun so I will have a nice smooth finish to scratch up with stuff stored on the tongue.
I decided I wanted a 4'6" x 8' box. I built the frame and planned the rest at the same time.
EDIT: 6/3/15 I am almost done while I am writing this edit. One thing I would have done differently is bought a 1500 lb capacity axle. The ride is too stiff with this 3500 lb. axle.

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I mocked it up in tape on the wall to decide the side profile shape. If you look at the shape on the wall, the front is different now. I couldn't sit with my back against the front wall in a chair with that big of a radius. I liked the look of the Moby1 but didn't like the ceiling height. So I bumped it up a foot. In the mock up picture the sides are screwed together so I can use a router to cut them out at the same time.

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I also cut out 14 2" wide ribs out of the plywood for the hatch. I had no idea what I was going to do with these but knew I would need them. That was an incredible amount of wood shavings. I found these little gems at Home Depot. Aluminum channel made to cap plywood. All lower edges will have this and then after the aluminum skin, they get another angle on them. I attached them with temporary screws and marine Goop brand sealant. I am a big fan of butyl tape to keep out water but this needed to be glued together, which butyl tape does not do.