We (ok, my husband) worked with a similar idea. He used the plexi-in-the-oven method that another member talked about. That would mean taking the bottom out of yours and replacing it with the plexi (with a drain), or building a lip around the inside, mounting the plexi on that and putting a drainage bucket on your bottom linoleum. We have a lip built on the inside, put a wire shelf in there and put our plant pots on there. The plexi is under that. Clear as mud?