Done a lot of thinking on this for a lot of the same reasons you have. There are several problems. One is you run twice the size of jets so your fuel consumption almost doubles taking away the advantage of the cheap prices. Another issue is methanol is very corrosive and after each run you have...
Also my donor ski was a vxr which is pretty close to square nose parts. The other boat was a wr3 which shares very little. In my opinion the vxr is the best boat building hull. It has short drive shaft and mid shaft compared to most couches. A square nose would make a good build too.
I would make it flush if I were you. There are to many ways to break off the nozzle. I ride some rocky rapids on occasion but even at the lake you could bump the pier and break your pump off if it stick far past the boat.
Here are some pics from the early stages of my build last year. Its a pos...
I love my jet john. Currently have a 650 sportfish was talking of and am going to eventually put in a 760. It really is the only way to go. I can smoke guys with boats with 90hp jet outboards.
We need a sub-forum for these builds.
And if your looking for a free there is cooters pond in Prattville its a safe ramp and not but about 15 minutes from downtown Montgomery. Those are the two main river ramps i use. If I had some free time I would come ride.
You definitely don't want to be at that boat ramp. You need to go to Montgomery marina its just past the race site, it costs $5 but is on private property and monitored, so it's much safer.
For the coupler on the mid shaft I have an old drive shaft cut short and ground flat spots to put in the vice and to hold the drive shaft i have an old mid shaft with flat spots.
I bought a 400ex a while back for 1500 and am pretty pleased for the price wish I had a 450. As for the raptor they are out handled by the 450 by a long shot.
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