By today's standards Desert Teardrop's plans leave a lot to be desired but several years ago they could have pointed builders in the right direction and had a shape template which resembles "Kit Industries" 40's teardrop. Too bad he hasn't updated plans or even responded to correspondence.
When I started my build if you Googled "teardrop trailer" you would get very few hits but now there are Forums like Mike's and many web sites with how to build including mine. Now days you don't need plans but can just surf the web and with a little imagination sketch one up and incorporate the things you need. Lots of great ideas out there.
Denny