i wish you were in florida, i know just the guy. If your in NY I think i know of a guy i can put you in touch with that can do the project, or find you one. i've emailed him just not 100% sure if he's in NY or if my memory is wrong.
i'm contemplating building one myself but, well, that's wrong, having one built for me, while I hold the flashlight and hand him the right tools, its over my head, it comes with a price tag, i've already located a hull that's been prepped for the motor mounts and shaved for the pipe, but hasn't been cut in the back for the pump yet, but from beginning to end (with life in between) it will be a 3 month project, and if I try to stay under a 3K budget it might take longer as i get stuck on parts. The problem with the project is that the only thing i'll accomplish is getting a better version of my modded 787 x4, so its redundant,
it might make sense to gear my efforts and benjamins toward a used rxp that will have enough power to keep me happy, and the storage and fuel capacity that will allow me to make it my long distance cruiser.
but just for giggles, i'll share my vision, taking an x4 hull stripping it to nothing and painting it high gloss black including coating the inside with a contrast color so its mint, factory new, 951 with mod head, pipe, pump/prop, proks, umi, beach house, oversized fuel tank. (probably missing something)
Price tag with no labor between 3K (under budget) 4.5K (extreme) really just depends on how much to spend on the carb's and pipe, you can add $1000-1500 to a project quite easily.
i did ask my buddy that has a modded x4 with a 951 how much he had in it and it was over 4K not counting labor but the thing is a beast !
bottom line, i'd be surprised if you could have one built for less than 3K, you'd probably be better off just finding a complete machine that's been souped up within a 250 mile radius, they do pop up on CL every now and then.