I made an accurate drawing of the cradle for my H340 a few years ago, which had "H34" welded onto it by the way, because I was going to load it onto a small trailer and move it to another location but I had to make some mods to do it, which is why I took the time to make the sketch. The framing is accurate, including the post locations, but the diagonal bracing isn't complete, nor is it necessary accurate, but that's a minor omission. If you want my CAD sketch, you're welcome to it. Or I can dimension it so a fabricator can use it, though as I said, it's not complete.
One huge problem with that cradle is that it's pretty light, and the marina always supported it only on the corners, so the pads tended to oil can the hull. Every season, no matter how many times I asked them to block under the keel, I'd have to go there and do it myself, with an 8 ton bottle jack and some patience. With the boat on it, and only blocked at the corners, you could see the sag in the middle. The three cross members under the keel were only 5" channel, same as the welded frame, layed flat, which of course is the weakest axis in bending, but they're just layed on the lower flanges of the inner longitudinal channels, so they could be moved around to suit.
The boat weighed about 11,000 lb dry, according to the specs. Hunter recommended putting about 2/3 to 3/4 of the total weight on the keel when I spoke to them. Heck, 1/3 of the total displacement was the keel, after all. The marina routinely got about 5% of the weight on the keel (educated guess), as the cradle would simply deflect under the load so the pads, primarily the corners, ended up carrying the weight straight down into the blocks.
The bow had two jacks with a channel between them and curved cutout in the lumber to conform to the hull. The stern had only two channels (face up) with a 2x4 layed in there and a big gap between them so the keel could pass through when trailer launching, or just so they didn't have to lift it over the cradle with a Travelift.
If you ask around your marina, I'm sure they have a connection for cradle building, if they don't do it themselves, though if they do, it's possible if not likely they just sub it out anyway.
I took these pics after I sold it and the new owner had taken the name off the sides. :cry:
