Dennis, I had a 1981 36 KCB and fabricated a second propane locker. The seat will be screw fastened from below. I used appropriate diameter and length cardboard sono tube as a template. I used glass and west system epoxy. I cut the hole with a jig saw if memory serves and used the cut out as a bottom for the locker. I also put a flange on top and a drain below to a small bronze thru hull above the water line. Then you just copy the SS piano hinge from the other locker. I did not pipe it, I would simply change tanks. The trick will be getting a big enough sono tube to fit your tanks, but it’s a really easy job! Long arms will allow you to reach the screws from the 6 inch plastic inspection ports. Let me know if you need more info. Len Mitchell Crazy Legs 1989 37+ Midland On
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