Dave: The shelves are made using 3/4" pvc pipe with "t"s, almost like a ladder, then the shelves are made the required size with the corners cut out. They are then pressure fit into place. I wrapped mine in drawer liner (kinda like mac-tac but not sticky, and I put an edge on it so things dont slide out. There were no curved end shelves to my knowledge but I an considering putting some in.
Jen: The flooring is just click flooring with white caulk around the edge, Its the only thing I could find that was moldable to all the curves and uneven edges.