They are two separate cabinets, which will go in one at a time, slide horizontally in place, and the corners still have a little wiggle room to get them tipped in. Worst case, I can saw off pieces and glue/fillet the bits back in against the hull. The fits look really tight, but it is about 1/4" of wiggle room either direction. Keep watching the website to see if it goes well or if I really screwed up royally!
It is designed to have one seat box go in, then the other, then a removable section of sole is screwed down in the middle. This allows for hard mounting of the seat boxes, stiffening the hull up, while the walkway will just be bedded in 3M 101 so I can cut the bedding and pull the sole out to have a look at the bilges when need-be. She's a real wood boat, so there might be a little more maintenance than one of the designs here. Talking with an owner/commercial fishermen, he does paint every 3 years, and thats about it as far as maintenance goes, though he allows water to run into his bilges, where I won't.
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You are one smart builder.
How was the skiing. Hope you and your wife had a good time! 