Go for it Dennis. I wouldn't use the corrugated plastic cardboard like I did however. The cells in between surfaces trap air that makes the thing try to float up. You have to shake it once submerged to dislodge the air. Still, you need to hold it down in some way. Ideally a smooth textured acrylic would be best, something like this http://www.tapplastics.com/product/p...ed_lucerne/549 . It's not the cheapest materials but the article that was mentioned in this thread in an earlier post indicated that washing efficiency was increased by using chambers with textured sides. Good luck and have fun!