I used the old FX1 pump nut thingy mibobbers and piloted a hole for the ring to sit in. I then mixed a thick batch of epoxy filler and smothered it all over the wings of the nuts to lock them in place. Doesn't look good and I am sure there is better ways of doing it, but I torqued the hell out of those pump bolts and those nuts didn't move so I think they worked.
Jon and I spent about a day and a half putting this boat together. All in all, I am pretty happy with how it turned out. Its missing a few items but you get the idea of what this boat is all about.
Oh yeah, that is a complete unmodified superjet pump in that hull!