how big are we talking?
I use 1/8" and 1/4" thick lexan on the competition robots that I build as armor to protect the high $$ electronics, it is surprisingly strong.
this might work for you I buy from them all the time: http://www.andymark.com/SearchResult...=polycarbonate
you could make it in sections (going off the design I linked to in my first post, having multiple doors... smaller pieces are much cheaper usually)
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