Munroco: Clear polycarbonate sheet is giving me some search results at the DIY store. Looks like I can get a sheet more than big enough for about $20. Now I'll need a thing for my drill for big holes said:Yeah you can get large sheets of it. I did 8 tanks with 2 sheets. You can cut it with scissors. Drill a hole with your largest drill bit to start it. It would probably be easier to melt it. The only holes I drilled were for airlines so I didn't need a large holesaw bit.