I would think thin acrylic would work best, it's "relatively" easy to work with (easier then sheet metal imho) Another thought is the bath enclosure plastic, it's about 1/8" thick, and is fairly easy to work with also. They usually sell it at home improvement stores in 4'x8' (I think) panels. And you could always work with 1/8" laminate wood that's used to put a faux wood finish on table tops etc.