hi mike, if I remember your previous question it had to do with a kind of wedge sitting between the thighs? That's more connection than I want, the inner thigh support that I'm talking about is simply the indent that your thighs make with the seat rising up about and inch between the thighs,where the seat then flattens out and the hole for bilge pump/whatever can go. as far as multiple bags , I did use seperate smaller bags at the hips since the big bag that is being used to make the mold is pretty much stretched out at that point, I had to make successive mixings and sitting on expanding foam to get the final mold,4-5 times. Since the seat gets carved and sanded a lot, I think it would be easier to just leave it as one piece also it takes successive efforts to fill the bag and that couldn't happen with multiple bags. Made one seat with vinylester resin,epoxy another time. With ester resins the whole seat pretty much hardens with a bang, with epoxy the area under your butt and between thighs(ouch) goes off but the side pieces that aren't confined by your body might still be soft or tacky. I carve the front and back of the seat so that the cloth could drape over an inch or so then get cut down about 1/4"-3/8" to provide more strength than just a bare edge. Misc thoughts, when the foam is expanding it can't float you up to get a nice rounded shape, so after the back and side of the bag begin to fill up you need to hold youself up an inch off the bottom for the foam to fill under. later when everything hardens you can get in/out while sanding it down to perfection.

After the seat is all done and installed, you can attach D rings or drill holes for bungies, I epoxied in D-rings or loops of nylon webbing so that bungie can lace between front of seat and bottom of kayak in front of seat, my seat has about 2 1/2" inches gap in the front between the gap and the bungies I can tuck in a small drybox, sponge, and water bottle, all of which stays attached even when exiting less than gracefully.