The Tail Feather concept has been around for years and years, but the original owners couldn't quite get it off the ground and three or four years ago the owner posted the business for sale.
I came back across it today in the local newspaper as Quite Lite. The concept is a small standy trailer comprised of various molded plastic panels that can be assembled (and dis-assembled for storage) with roof panels. The foam insulated panels are assembled and mounted on a buyer-provided trailer.
The new business, which anticipates shipping panels this May, offers the side and roof panels, and a door panel for a 5' x 8' base model for $6,000. They claim that the roof/sides/door panel package weighs less than 400 pounds. There is the option to make a slightly longer trailer with the addition of a side panel.
Anyway, you can check it out here: QuiteLite Tail Feather
I'm intrigued by the concept, but they're still describe themselves as pre-production. The company is in Longmont, CO.
They also offer a small 10 x 10 cabin assembled from molded panels.