I am in the last stages of completing my shower (7x5) and I'm now looking at what to use for the enclosure (frameless). Tempered Glass is going to cost me $3700.....OUCH!! I have also been looking at Plexi, Acrylic, and Lexan. All of these in 1/2 inch sheets are still less than the tempered glass by a couple thousand. I probably don't need them that thick but I know I can get it. The glass was going to be 3/8 thick....I'm guessing I could use the same thickness with the other materials. Has anyone here used custom cut Plexi, Acrylic, or Lexan for a shower enclosure? Can you speak on durability and how hard is it to keep clean?