Thanks, that's super helpful.
I can make it all fit in theory. Floor to top of seat height in this section sketch is 865mm, which is 95mm higher than the original fold-out seats that came with the boat. It does put the seat base above the gunwales but the seats have armrests and I can incorporate a side barrier into the new rocket launcher, so that shouldn't be a major issue. Also the gunwales sweep up towards the dash so there's still side support forward of the seat.
Tempted. Very tempted.
Is the difference in comfort enough that you'd give it a solid "would definitely do it in any other boat I owned" or "it's nice but I could live without it"?
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