Having a large and weirdly-proportioned body, I never expect anything to fit out-of-the-box unless built custom, and the used OC-1 sailing canoe I just took delivery on did not disappoint in that respect.
I moved the pedals forward about 1.5" and the seat back an inch - and that made things tolerable.
But now it has dawned on me that maybe elevating the seat might help too.
Putting a 1" pad under the seat seems to have raised my hips relative to the knees as expected and, as soon as the water around here is no longer hard, I expect to find out if it's good for anything.