A good source for sheet aluminum is airparts.inc. Depends on how much you need. Home Depot has small sheets of aluminum (in our experience). So, if that's all you need, it would be fine, especially since you are planning on painting it and not trying to match the aluminum "look". We have also gotten aluminum for small projects at Fleet Farm, but not sure if they are in Montana.
To paint your walls, make sure they are very clean and well-rinsed. Use a good primer like Bondz. We used exterior latex paint, and it still looks good 12 years later with occasional touch ups. We did paint over vinyl wallpaper, though, so might be a little different for you.
Good luck!
Kay
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