Chiming in here.... I'm the aforementioned friend, helping Monkeyboy with the build... it's in my back yard. He's wintering in the Hamptons, so to speak.
I'm also somewhat the designer on the project, it's kinda like my day job - so I'm doing the whole thing in Solidworks, and man, am I jonesing for one of those CNC router tables like in the other threads.
When the Teardrop was mentioned, I started doodling, and came up with this; The thought was that the trim would be cut from a single thickish sheet, and provide some structure to allow a thinner inner skin. I'd kind of tossed this one off when I heard monkey howls - I'd never though of Cthulhu.

The problem was that when I put the HF trailer wheels and fenders on it, the curves in the trim didn't work, and the axle height was all wrong. Plus, I never got the door right, and I'd like to find a bit more volume. I've learned a lot on this site, and am incorporating as many of your suggestions as I can in this design, but I'm also cheating in a few places. I'll post more when it gets finalized, but here's a teaser:

Mine's gonna be a Woody.