Well, I'm starting to build another one this weekend. I cant wait for the spring. One thing I always forget to mention about the videos. I never ran the boat on those rapids since I put in the 700sc motor. So all those videos(on rapids) were with the boat using a 540 car motor and 6cells.
The 12cell version and 16cell stayed on the lake. However this will change.

I stopped running the rapids after chipping my impeller several times. Heck, in one of those videos unbenounced to me, a pebble was in the drive for about 3minutes, not good.
Out sheer need for rapids, I'm just going to do some tests and find a way to absolutely guarantee I wont suck up a rock, like a window screen if necessary. Might solder together a brass intake screen....something. Regardless there will be more videos, with more jetboats.
If your interested in doing this as well, it costs about the same as setting up a normal FE, just a different drive and if you get a KMB drive you dont even need a motor mount.