Finding The Right Wall-Mounted Display Case: Driving Me Nuts

Old topic for Reference:
http://goccf.com/t/360179

I've been using a cheaply made challenge coin wall mounted display case, and my coins are tarnishing in ways that I don't like. I'm suspecting that it may be due to the outgassing of the materials used to make it.

So I did some research and found mahogany is the best wood, but pre-made coin cabinets are expensive boxes mostly made and shipped from the UK. I don't have a problem with that, but I got a shipping quote of £300 to the US for cabinets that sell for £250.

So think to myself, "I'm a pretty handy guy, and there's a rare woods lumberyard within driving distance. I'll just make one myself." I then mention the subject at a carpentry forum where the guys there pretty much disabused me of the notion of my doing things myself - at least until I become skilled. Evidently, mahogany isn't easy for an untrained carpenter to work with.

Then I found the old thread above which suggests using walnut wood. I happen to have found a challenge coin case made from walnut at Etsy, so I'm thinking, well maybe I'll just get two of those.

What I want is a wall-mounted display case for my 2x2 PVC-free flips that allows me to look at my coins when I'm working from home. If they are in a box, I'll forget about them, but if I can see them I think I can enjoy them more.

But I don't like how they are tarnishing and spotting.

Am I wanting the impossible? Should I just store the bulk in a metal slide case with desiccant, and have a few out to handle? Or should I try the walnut challenge coin display cases?

It's one of those things that's driving me nuts.