Heya Fishingman
Nice meeting you quickly at the ramp today at Hinze mate.
I've thought about how to rig a yak to stand and cast, as it will be something I do eventually.
The best mothod I have seen is to first look for a kayak with a flat floor (Tarpon T160/T140, Heritage Redfish etc), and one that will allow you to mount a couple of Scotty Kayak Stabilizers (which are removable) behind the seat area.
The stabilizers can be removed easily when your not using them and tucked away, and all that is left deckside is a couple of Scotty mounting points which can double as mounts for a couple of Scotty Rod Holders behind the seat area.
Going with this method doesnt compromise your kayak's speed, such as when used on a T160 or similar fast yak, but still gives more stability to stand than on the widest kayak.
Thats the best way I have seen so far at least?