I've started building one, but am using my own plans. The free 'generic benroy' plans on tinternet are fine as a starting point, but it's a bit of a basic design and I want one that's wider than 4' and possibly taller too (hence why I'm designing my own). I've already adapted my chassis to the size I want and to ensure the axle's where I want it, but that's as far as I've got at the moment. Below is a photoshopped version of what I'm building, scaled to 8x4 at the moment, but I might go to 8x5 if I can find a suitable material to clad it in. If anyone here does have any plans or photos of their teardrops, I'd be interested in seeing them too!
I was reading about these a while ago This guy done a good one on retrorides http://retrorides.proboards.com/thread/67389 And there was a link to this http://www.tcgb.org.uk Might be somthing there