wrote:
any advice? am looking at using the jet ski hull's bottom half.

Trying to use a planing hull as a displacement hull is a recipe for
disappointment. Did you ever notice what a jet ski looks like when
moving slowly?

yes. good advice. the intended use is for river floating for wildlife
observation.
would a jetski hull minus weight and a lower CG achieve stability?

wrote:
yes. good advice. the intended use is for river floating for wildlife
observation.
would a jetski hull minus weight and a lower CG achieve stability?

I don't see why not. You'll have to experiment to find the optimal
sitting/kneeling position once the engine and drivetrain are removed.
For that matter, is there even a place where you would fit comfortably
in it? I haven't looked inside one to see what the shape is like.

I take it that this is a "freebee"? If it's going to cost you anything,
you'd be better off to buy a small, used kayak. There a thousands of
inexpensive recreational kayaks languishings in garages, sheds and
yards. They only sell for $300 new, so you can probably find one for
under $100 used, probably with a paddle and a PFD thrown in.