After 2-3 days the cell cast 3/8" started to warp a little bit. Being probably too much of a perfectionist, I took it off, dried it out, and glued two strips on the long axis one in the rear by the HOB filter, and one in the front where the lift cover is. So it's like having a T-beam for support. It is now holding up without significant warping. I'm glad I held off on the big buy a little longer. The biggest cost was about $20 for the cell cast acrylic. Next was the labor that went into it. It came out beautiful and functional. Maybe I'll go into business making custom acrylic covers. <smile>