Ok I was just curious about what you were running figured you must have thought about it for a while if you were considering a obj and knew what they were. I'll say this inboards are far superior to outboards in terms of speed and ability to pull a tuber/skier if you went out to the lake. The sport jets are pretty impressive in terms of speed and power. If you went inboard if you got a good pump you can always mod the engine assuming you get one with an engine with good aftermarket support and change impellers in the future for better performance. Just an option I'm throwing out as obtaining 40mph plus and pulling a tuber/skier is much more easily done with an inboard jet vs outboard. I prefer longitudinal stringers I think it makes for a stronger hull, if it didn't then why do most mud boats and northwestern styl jet boats have them, both style boats are meant to take pretty severe beatings. I'm not saying horizontal doesn't work plenty of boats have them. If the builder near you is reasonable, and you can get the hull you want from him for less than a manufactured one I'd go that route. I think you get a stouter hull for the same or less. I'd rather have .125 (1/8") or .190 (3/16") bottom over a .100 which is what most of the bigger manufacturers use. Friend of mine that got the 2060 boat from uncle j it came in around $5500 for the bare unpainted, unrigged hull, with no trailer. I thought that was pretty good considering how stout it was. It was lot beefier hull for a lot less than what an alweld, weldcraft, seark, grizzly, or roughneck hull would have been. Yes we had some time wiring it, rigging it, and painting it but he ended up with a better product I think.
Also some other good but lesser known maker of hulls are in missouri. If your willing to make the drive to MO there is miracle marine, and also a little shop called midwest jets. Midwest jets he can make outboard jet hulls, but primarily makes inboard sport jet powered hulls for running the gravely rivers in southern MO that sound similar to what you want to run. Just trying to give you all the options I can think of and would consider myself if I were thinking about spending the kind of money it sounds like your going to spend. Sometimes a trip is worth it to get what you want. I know for my buddies hull the trip was worth it and we had fun. We planned out a whole trip around it spent almost two days getting the engine jack plate, and engine on the boat, doing basic wiring, basic electronics, and safety gear then spent another three days fishing the LA coast for reds.