That is a very clever design, Samhain. A company has recently started building a variation on that concept. The "Hi-Lo Mojo"

http://www.hilomojo.com/

Anything anyone would ever wish to know of teardrops, how to build and even free construction guides to download.

http://www.mikenchell.com/forums/index.php

Here are some more pics of mine. I had considered pop-ups but most are too heavy for my car and the set-up and maintenance factors weighed on my decision. The teardrop is simplicity. My priorities were a permanently-packed secure sleeping space. A 12' x 12' Eureka screenroom provides expanded living area for lengthy stays and a Kirkham auto canopy (stored in the teardrop) provides quick shelter off the back of the Element.

I saved money and weight by having my teardrop constructed without cabinetry and without a kitchen galley. I wanted the option of sleeping cross-ways in the teardrop, which the 6'-wide allows.

Would be fun to custom-build one, given the talent, tools, time and space. In lieu of cabinets, I attached Cabela's "cot organizers" to dowling and closet rod hangers that I bought at Home Depot.