hey dana, you could buy my camper van and change it to desel! it just happens to be for sale as well (see my for sale post in this tribe)

sounds like a great project. I bought a 84 motorhome its a Ford with a 6.9 L diesel, for burning man last year and then to use as a home base for my art residency program in Mendocino. All was well untill the rains came, even though I sealed the roof, and around the windows water still got in. My planned upgrades will have to be posponed and the mold will have to be delt with. So if you are going to redo a trailer make sure it does not leak to start with. look for dry rot under the paneling. The structure must be sound before you do the inside. I was looking for a step van when I found the motor home. and well I should have gone with a step van or box truck. they are made much better then an RV. For a trailer look at airstream and scampy (fiberglass shell). For the interior I have been looking at bamboo flooring and bamboo plywood as an eco friendly material. look at www.plyboo.com some great stuff. Also recycled denum insulation could be great in rv's but I have not heard of anyone doing it. Some thing to look into. The great thing about redoing an rv is the small space. means less $. Please let me know how your search is going and I will do the same.
good luck
-Miles