From Fiberglass Supply's website, I only found Divinycell H80, H100 and H200. For the H80, I found the 1/2" listed with these P/Ns and descriptions. Is this what you used?Divinycell is made in 1/2" thickness, I got mine from fiberglass supply in Seattle, and I think it was a little cheaper. They also carry H80 as listed in the chart. It's the 5lb foam which is closest to Last-A-Foam's 4.5lb specified for the Vision. I'd rather go stronger and take the extra weight, even if H45 still has better numbers than the Last-A-Foam. There is also an H60, which may be the best choice, but to be honest the foam makes up a very small part of the weight of the structure.
I've heard about doing layups, bagging them and then put a load of (hot) water over the bags. Might also work for Divinycell, H-grade requires 70-80 C to form (170F or so), HP requires much higher temperatures. A water-cooker and a small water-pump might be required to keep/make it warm (enough)An oven big enough to gently warm big pieces is a little hard to come by. For smaller more intricate pieces a used kitchen oven (out in the shop) might work - anyone done this?
The most straightforward approach is to glass the outside of the panel before bending it. As one builder said "I could bend a potato chip in half without breaking it if the outside was epoxied and glassed." This is the basis of Steve Rahm's "foldaplane" method for making curves, though folks had been doing it long before that.That would be an awful lot of tape but maybe there is another similar method?