If you want cheap, easy, and very effective, use Coroplast. It's basically like corrugated cardboard, except made with polyethylene instead of paper. It's cheap ($110 for 10 4' x 8' sheets from Home Depot), resistant to nearly all fluids, and very easy to work with. It took me about two hours, and less than $50 to make an enclosure that works perfectly, using a shower curtain "door" for access. I eventually tossed the shower curtain, and put in a pair of 2' x 4' sliding Lexan doors. I built the enclosure by just bending the Coroplast, and screwing the panels together with 8-32 screws, nuts and flat washers. I can remove the whole thing from the machine in under 10 minutes. For under $100, you can buy 15mm 8020-style extrusions from Misumi and make a metal frame, with the Coroplast panels slipped into the grooves in the extrusions.

Regards,
Ray L.