I've been thinking about one, if for nothing else the exercise. However, at nearly 400 pounds I just get the vision of an upside down pyramid. Maybe one of those float pontoons will be more my speed.
Several of the major kayak manufacturers make kayaks for larger paddlers. Ocean Kayak has a yak named the Prowler Big Game that has a max capacity of 550 to 600 pounds and it actually only weighs 9 more pounds than my Prowler Trident. That's enough capacity for yourself and PLENTY of tackle and even some room to keep a Striper or two like in your picture!