Kelleyaynn wrote:I've seen that 1/8" mahogany plywood has been used on a few teardrops to skin the outside sides. Where in the world can you buy it? I can't find anything online thinner than 1/4", and have no idea where to start looking locally.
And, where do you get the thin aluminum to skin the roof?
Total newbie, and wondering why I am considering such a project when I don't know squat!
Knowledge will come weedhopper

I didn't know squat either until I started lurking on this site. Ask questions and many will come to your aid.
As far as the ply, try a wood shop that supplies ply to cabinet makers. You aren't going to find it at a big box store. The bigger urban area you live in the better your prospects of finding someone.
I got my 5x10 aluminum at an aluminum supply place near here that supplies aluminum to sign makers. You can also try a trailer repair place, they usually have aluminum on rolls.
I'm sure others will weigh in on their sources. Good luck and continue to learn.