JJ - I've probably seen at least half those videos over the last couple months. If you search on "kayak halibut" you'll probably see some videos from one of the guys on the other forum landing some hali from his yak. Landing a hali is a top end goal of mine.
I've no experience with kayaks, but it seems you don't have much room for rod, tackle and other stuff. Why not a canoe or a jon boat?
Well, it's you're fault if I don't have much room. :D
Seriously though, there's 2 molded in rod rod holders behind the seat, a mount the previous owner put on for a fish finder, another mount he'd put on for a Scotty rod holder (in a good position for trolling), plus I have 2 more bases for Scotty rod holders that I need to decide where to put. The tank well (a depression/flat spot behind the seat) is commonly partially filled with a milk crate that's used to hold tackle boxes and such. Lots of guys also add some pieces of PVC as additional rod/net holders to the milk crate. There's also a hatch up by the bow that can be used to store stuff like a battery for the fish finder, extra rods, etc.
The newer version of my yak has a hatch that's right between your legs that is meant for storing rods, your lunch, etc. I'm hoping to be able to upgrade to one like that, or a Hobie kayak with the pedal drive in a couple years.