The lexan was salvaged from several industrial skylights. I bought six 4' x 10' sheets for $ 50.00 out of a newsparer ad for "plastic sheeting"
It will saw fairly well but you have to make a couple passes and real shallow cuts with a fine toothed blade. It will router very well if you have a guide without a guide it melts and grabs the bit and there is no way to control the cut. I wanted sides and all in lexan but the learning curve claimed a couple sheets and the boo boos were just to embarassing to live with. Mine was so thick 5/16 " it was difficult to bend. I heated a couple scrap pieces and it will bend and retain that shape but too much heat and internal bubbles will form and turn the area white. For a standie I'd build a curb and place a oversize cut on top sealing with 100% silicone and
pre drill and screw the lexan to the curbing with aluminum flatstock on top of the lexan to distribute the pressure evenly.