Barkeater, wow, upside down it looks a lot more canoe-ish than I had expected. Please post a topside photo.
While I think those Alden shells could be converted into some kind of more “traditional” paddle craft, I’m not sure how suitable they would be as a decked canoe, at least in my uses. Not a lot of space or weight capacity (210lb) for gear storage, and with a 24” waterline I wouldn’t want the seat raised very high.
But, having saved a couple from dumpster-dom (good on ya!) some kind of rebuild/rehab sounds like an enjoyable experimemt. At 3K with the rowing seat, which I expect runs nearly $1000, there is still a couple grand in interesting hull there; partial decks, bulkheads, access port.
The least expensive and easiest conversion might be to something like a fast SOT, with a low minicel seat, foot brace and back band. Not sure about the flat bottom in that guise; could be a SOT that excels in the shallows.
Deck or cover the cockpit on one and use it as the ama on crossbars (akas?) as an outrigger-style canoe?
Or, again using two those hulls, add a couple connecting crossbars and a sail and converted into tandem cockpit catamaran. With some cogitation on easily connected crossbars and mast/sail either rig would still be car toppable. Maybe some mesh between the crossbars for a gear platform.
Whatever you do with them once converted to something else they will be mystery boats, and those are always fun to have out and about around WTF curious fellow paddlers.
The mind boggles; looking forward to seeing what you do with them.