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...do you think this less tapered design is decent?
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It looks good. Did you gain or lose headroom?
The copy of the Template I have has an instruction to scale to height as you have done for the top, and then scale to equal the wheelbase to work out the ground clearance. Does yours have that note?
The "Aero Rules" in post #16 suggest width x 0.45 (96"*.045=4.3") for the radius, and you have to bump out 18". So it sounds like you could bump out 1' and radius the last 6". If you are planning for the section over the cab to be only 5' wide, the radiused edge could roll back to mimic the template bullnose curve. It would look Art Deco. Instead of a circular radius, a parabolic curve would be nice.
The advantage to using galvanized steel is the body won't turn into an electric battery that eats itself (corrosion).
Picture a 2x2 wood frame without it's skin. You'd have to bracket every joint to make it rigid. You can't just nail it. And it would fight your compound curves all the way. Conduit is easily bend and like Bowlus you could weld it all together (assumes you have a welder, of course).
You could drill holes in the sheet, align it over the conduit and spot weld the holes shut, or drill both, dimple the hole in the sheet and use pop rivets. The nicer it looks, the happier you will be.
What did you think of the Superellipse? What did you think of Drop City?