Re: your thoughts on 3 dinghy designs?
The Redshank is the only one I would even contemplate for myself. Those other hard chined boats will neither row nor sail nor tow as well as that more sophisticated and rounded hull shape. But I think you'd be even better off with a round-bilged pram design if you have to stick with a boat that short. SF's very similar Greenshank Pram is almost certainly a better and more useful boat in every way for such a tiny boat.
Amphibious Macroplankton Oughtredia doublendus
Mostly found frequenting the littoral and estuarine zones in the southern half of the Salish Sea, though sightings have been recorded both north and south of this area, and occasionally, but rarely, inland, in freshwater environments. This species lives on micro-brewed beer and dutch-oven biscuits,and displays brightly colored nylon and gore-tex plumage during the rainy season. Approach with caution!