Thanks for thinking about it. I basically threw together a few ideas—the shell, the frame and the suspension—that are really independent. Hanging two wheels on a single suspended pivot is probably the least viable. It's intended to reduce the frontal area for the wheel and tire, and *might* work retrofitted on any teardrop.
Likewise the Silver Streak frame detail could be applied to any teardrop.
The compound curve wood strip construction is optimal, but I was trying to work within the stated teardrop parameters. Your suggestion could work on this frame and suspension.
Here's how Bowlus handled the fenders:
But I like the idea of a flat-topped fender that folds out into a bench or table.
I'm back from a road trip so maybe I'll make progress on the 2nd iteration. On the other hand, I have a design for a teardrop that would scale down to bicycle or motorcycle size that is the traditional flat-sided shape. I'm not sure where people's interests lie.