I'll 2nd Ken's post on the do-it-yourself PWC cradles. I fabricated 2 sets of them a few years ago. Never thought to bend tubes, which sounds like a good idea. I just had 5/16 aluminum plate cut with a "V" to match the deadrise of each hull, both fore & aft. Then, we welded mounting flanges to these plates (for the deck), as well as the top of the cradles, in order to line the surface with polyurethane strips to prevent scratching the hulls. Finally, had the pieces powdercoated and mounted them to the upper deck with self-tapping stainless.
There's a couple of aftermarket marine companies making PWC cradles, but I didn't like the designs. Besides, it made for a fun project.