Dennis, Yes I have done it in our 1981 36. You need to remove the lid and reinstall it with ss hinge(s), it’s screwed on from below and you may be able to get there from the inspection port with a long arm. I used a suitable piece of cardboard sono tube for a mold and wrapped it with glass and epoxy. I built a 1 inch tab (lip) on top and used the round glass I cut out for the bottom of the new locker. I installed a drain in the bottom. The tricky part is finding an appropriate sized propane tank to fit the locker and installing an above waterline thru Hull and hose to vent the locker. I only used it for safe storage, you could pipe it if necessary. Contact me off list if you need more information. It was a fun job that only required basic measuring skills. Len Mitchell Crazy Legs 1989 37+ Midland On
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