Shooting from Kayak
I don't have any experience shooting from Kayaks, just Kayaking through 1-3 level whitewater and stillwater. I would definitely expect to be able to comfortably shoot from a good kayak without flipping. I am talking about a Necky or even a Hydra touring boat excess of 15'. One of the ten footers you buy at Dick's would be a bad idea. One with a more bladed bottom versus the traditional flat/round bottom. You could get one of the outrigger systems, but I imagine just buying a decent kayak to begin with would be a comparable price and much simpler in the long run. Plus they usually have thicker plastic etc for durability.