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I've thought of similar, starting with a ~$200 cheapo 4 X 8 open flatbed trailer from Northern Tools or Harbor Freight, the kind that folds and stands on end to take up less garage space.
Replace the cheap Chinese bearings and wheels/tires on day one, because they're worthless.Use Coroplast for the Conestoga wagon sides and roof, to act as wheel skirts and partly enclose the wheels for better streamlining. No point in wasting that space and having the wheels make extra drag. Insert fiberglass or aluminum tent poles into the flutes for stiffness. Extend the floor forwards to cover the folding tongue of the trailer, no reason to waste that space. Extend the floor aft to act as a loading ramp and to be the base floor for the teardrop tail. Use Coroplast for all skins, essentially shaped per your model shown above. Make a fairing to cover the axle below, turning it into essentially an airfoil shape to reduce drag.
This would be a sorta mini-horse trailer, with teardrop rear. Great for hauling motorcycles, and/or as a camper trailer.
Could probably do this project for less than ~$500 if all new stuff, considerably less if you can find the basic trailer on Craigslist or similar.
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