If you really never use it, then mahogany would be fine. You will want to seal it on both sides with some sort of finish. could learn something from the fancy wooden boats, as many of them are/were mahogany, used very near water, and need to look good.

I would go with a harder wood though.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-