I just realized the attachment bears little resemblance to what I'm planning right now. No fin keels or nacale. Each hull will be transported back and forth from Chicago to Sanibel on my canoe and kayak trailer--Trailex 1200. That will require on the beach assembly and eliminate nacale options like the Reynolds 21. I'd like to get a Reynolds 21, but then I'd have a pair of trailers to get back an forth.