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You can use plywoode or OSB(very cheap) and as long as you paint it with a couple coats of Killz latex cover-up paint water shouldnt be a problem unless it's constant.
Also if you can get some framing smaller then a 2x4 or just rip them in half you will save a ton of space and weight. A 1x2 frame with 5/8 OSB will be plenty strong unless you had a heavy magnetic ballast or something that needs some real support.
-------------------- "The proverb warns that, "You should not bite the hand that feeds you." But maybe you should, if it prevents you from feeding yourself."
- Thomas Szasz
"if you arent good with electricity dont go touching it...ive electrocuted myself twice...its no fun"