Here was my post on the first iteration of the frame:
I changed it up a bit, replace the "internal" loPro's with speedrail fittings to cut down on weight. I also moved the large bay to the front, and have a drybox there and it's a good seat platform. I use rigid foam next to the drybox to make it the same level so the dogs and passenger have a huge wide place to hang out. Small bay is behind that, still a drop bag, but cover that with polymax for simplicity. On day runs I still do the two piece piano-hinge wood platform and have drop bags in each bay. It's on a 14' raft.
I plan to make a flip seat bracket that uses speedrail, but still has the seat sit on a piece of wood so I'm not any higher above the cooler than now. I have all the parts, but haven't done it.