Where to buy mahogany plywood

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!
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!