There's no strict rules on seat height. The lower they are, the more stable the ride. But if anybody wants to kneel, you gotta leave room for the feet to slide under the seat.
I had one boat where the seat hangers for the stern were several inches longer than the hangers for the bow. The seat was placed well back in the stern where the gunwales did slope up towards the high stem.
Some folks like the seats sloped forward.
You might want to play around with dowel hangers before you decide. Like GBG suggested, you could start with them long and experiment with shortening them to see what you like. I guess you could do that with a truss hanger, too. But when you get to a length that is too short, it's harder to lengthen them!
Cartop Kayak Carriers
Full Size Sail Rig
Kayak Kaboose Trailer
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