Starting to assemble the frame:
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I flipped the axle to get a few inches of extra depth, and adjusted my design.
I'm thinking of adding a third set of hinges, so I can move the first two closer to the edge (they're not screwed in yet) and compensate for the "passenger" door beam bowing a bit. I'll be adding two more cross beams and some more vertical supports. Planning on 1/2" plywood for the floor to save weight. Not sure how I'm going to tackle the wheel skirts and nose yet.