Mike, so far the seat is either free standing or in one position (a bit far forward maybe) anchored with a notch that sits over the center rib (I haven't yet tried it there). I have a 70# dog that will go along sometimes and a cooler that will go sometimes so I am unsure about locking down the seat. Something with notches that allows various offsets from the center rib might be a solution. That could either be an attachment for the seat or another seat.
I am unsure how much the range of adjustment of seat position will need to be or whether I will be able to get by with a fixed position.
I may try something seat attached, perhaps with cords to start and see if the seat moving is an issue. The little pirogue moves along so easily I suspect unwanted seat moving may be a non issue with my laid back usage in sheltered waters. I know that when I got in the boat and the seat was off center a bit and I needed to move it it wouldn't slide without lifting my weight off of it. That said the piece that has the foot rests could have notches that engage the center frame allowing the whole seat/footrest assembly to move fore and aft.
I have a notion that something that looks like a little barbell with minicell ends attached to the seat with cord just might work. Width could be adjustable to a friction fit in the hull and reach could be adjusted with a cam cleat.
On the other hand I have used kayak foot rests on many different boats of various types and they work well. I have not used the Wenonah setup, but it does look interesting.
It may make sense to get more of a feel for how much range of adjustment I actually need (if any?). If the seat were to be in one place I think I'd be satisfied with a little piece of false rib glued to each side at an appropriate angle. I guess I am not ruling out a series of several of them.
The seat looks like the image below. Supposedly the notch goes over the center rib, but I am thinking the weight would be pretty far forward that way unless there was some effort to put some weight behind the paddler especially if my dog were in the front (where I could keep an eye on her). On hindsight I wonder if a stadium seat and a pfd boat seat cushion wouldn't have been the way to go. I could still do that.
