I think I'm sold on the composter idea. The mega-bux unit websites claim "80 uses" for 2 pounds of peat moss, so going solo and assuming 1 use per day, that means I'll get about 2.5 months of usage before I have to empty my 'holding tank'. There's not much that can fail, nothing really mechanically, and that appeals, especially that it negates at least 2 thru-hulls, & there's no fixing costly joker valves or replacing/cleaning tubes full of crud. The space footprint is a lot smaller, too - no tubes or extra space needed for an external holding tank, deck pumpout and below waterline seacock, and tubes to reach those spots...
Right now, I have the bucket sitting down into what was the deep bilge access hole, the square spot under the sink, and so I cannot sit straight up on the throne, the bridgedeck prevents that. But there is ready room to move the contraption forward a bit, if that is needed, for comfort or for someone taller than my 5' 9". Being able to utilize that space normally below the sole really helps a lot.
Chainplates - I'm borrowing a bit from here and there. Craig/Faith has me talked in to using FRP only for purposes of longevity and no maintenance worries, and I'm taking a page from Island Packet with how they distribute the shear forces on their boats.
Their chainplates are basically a grid made of SST plate; think of a sort of elongated TicTacToe board, placed up against the hull inside. Then take fiberglass rope, about a thumbs roundness worth and say 6-8' long, weave it through the grid, and take the two 2-3' 'tails' down onto the hull, getting splayed out farther and farther as you get away from the grid. Think 'long blond ponytail', wet out, and the end spread to cover as much surface area as possible. An upside-down V, where the apex/bottom of the V wraps over the chainplate grid up and around the vertical members, and the tips of the V spread out to distribute the force across a wide area.
I'll use fiberglass pads shaped like below, shooting for thick enough to double hull thickness there, bonded to the hull, and then do the rope thing over those pads to help spread the shear out and down. Bolts come thru the hole in the middle, with big washers and etc...
Regarding the missing pictures - those were linked from my old website, which is why they aren't visible anymore, that site has been gone for 4 years or so... I still have the images floating around, need to check and see if the posts themselves list the image names or numbers so that I could re-upload them... One thing is for sure: It ain't Bills fault!
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