A break is not needed to bring the rake up, unless you try to do the crimped vs in the bottom. It is your boat, but the more research you do, the less desirable those crimps will become. The chimes on the outside corners of the floor determine how the boat will turn more than anything else on a flat bottom. There are square, tapered and round chines. The cost difference of 5052 compared to 5086 isn't very much, but availability might be an issue. If you are in LA, check out "uncle j's boats". He builds custom boats and sells kits for what ever boat you design. He has built some serious skiffs with 250hp outboards. Whatever you do, post up some pictures so we can watch your progress!