I saw the plastic racks for holding Plano tackle boxes at Fastlane on Sunday.
Here they are on Amazon:
https://www.amazon.com/Hobie-Tackle-...anagement+rack
I'm tempted to replace my round hatch with a rectangular hatch, but the hatch kit replacement is about $115 and the rectangular bucket to drop inside is another $26 or so.
Rectangular hatch:
https://www.amazon.com/Hobie-RECTANG...tangular+hatch
Rectangular drop-in bucket:
http://www.austinkayak.com/products/...d=12538_1591_1
$140 is kind of steep for 50% more space than my round hatch bucket, but it would help, and the shape is more useful for things like pliars