There are a million ways to rollover a boat. They're all correct, unless the boat falls somewhere in the middle of it. And even then, you might have been on the right track and just needed some stronger wood or rope or something.
Ok, here's my strategy: To roll the boat without beating it up too badly, lift it up and spin it in the air.
I did a couple of things to get this done.
First, I laid 2x4s across the legs, right under the longitudinal 2x8s that are the core of the building jig. They're all at the same height. This ensures that if you have to put the boat down while on its side, the 2x4s form a straight line to take a bit of the weight, so the hull doesn't have to take it all at the widest spot.
Next, I tied the hull to these 2x4s so that the shell didn't slip off the mould framess !!! The only thing holding the mould and shell together are the sheer clamp cutouts (which I redid w/ some old pine to make sure they fit snuggly.There's also the occasional glob of dripped epoxy, which helps!
Note that all the legs, framing, and moulds stay in the boat for the entire rollover to keep the hull strong. There are still no chine logs, and no keelson. These will all be filleted and taped... There are also no bulkheads (next time I WILL put them in first...).
After that I built two gantry cranes. I used 4x6 uprights and 2x10 horizontal beams sandwiched around 1/2" ply, -just like over a garage door... Gusset the heck out of them to keep them from moving (see pictures).
We actually used the rachets on our nylon web belts to raise the boat. The problem w/ these is that you can't let them go. They're not made for lifting. They're made for tying down. These straps were our safety harness for the entire roll. Then we used the come-alongs to pull the boat up and around, -letting the hull slide on the belts. I was comfortable the whole time w/ the belts. I was not comfortable w/ the come-alongs (the wire type). Next time I'll use chain hoists or heavy duty come-alongs w/ chain. Eventually, once the boat was right side up, we had to lower it using the come-alongs. One wire hook sprung loose and we were very lucky that we still had the strap on at the time.
The wood gantry held up just fine and didn't budge. I estimate the hull to be somewhere in the neighborhood of 1000 pounds. With all the framing, let's call it between 1500 and 2000 lbs total.
A big thanks to my neighbor Mike for helping me out, and staying w/ it until it was done!