You're pretty much asking an unanswerable question because just when you think you've seen it all along comes something else but.... My answer for general purposes would be that a 1436 would be at the smaller end. You will find people that will say 12' but noone is going to argue with a 1436. You won't get a jet any smaller than a 20HP and the room required for a console (with steering) leaves very little room for anything else in the boat. You could possibly do a 12' hull with a tiller or stick steer (no deck, no console) but for the money you'd spend on the setup, the cost/benefit relationship doesn't make sense to me. One thing that is probably true is that a small boat will make you wish you'd bought one two foot longer to begin with.