So i started off this build a few months ago and used alot of information from this group so i figured id post my build . I started off my build with a 84 16ft bass tracker and a 96 seadoo spx with the 717 i actually ended up find another seadoo gts shortly after, that i used for parts. I used the jetski hull up to a bit passed the intake grate and formed my hull down to match the depth i liked. I then made a motor mount out of square tubing and yamaha motor mounts. 
