Completed this last week after 13months (9 actually working on the boat), build log on the Fyne Boats Forum:

https://forum.fyneboatkits.co.uk/viewtopic.php?pid=2917#p2917

I used a modified version of the Angus Rowboats seat system to fit the kit wherry which is lighter and cheaper to make than the drop in units.  Performs very well so far, we are looking forward to getting settled with how it handles.