This is why I love asking questions here instead of just going with whatever I thought of.
Indeed. I owe a lot to this site. I purchased the casters at Menards, but Lowes or HD probably have the same thing.
If I were to do it again I would use more cross braces and or throw a piece of ply or osb down as the pvc will bow a bit eventually and cause pooling in spots and thus algee. Hope this helps...