Heya Sheetsy,
Your boat is beautiful mate! Congratulations of such a fine build.
Re the ultimate fishing machine, A lot depends on where and how you want to fish.
For my money, I think the Southwind 15 comes very close to that. But for my purposes, I would like to see it 3 or 4 inches narrower. I think how far you want to paddle to fish and in what conditions is at least as important as the fishability of the boat.