Collin, Anchovy had a 2 gallon gas can for a holding tank when I got her. I converted the forward potable water tank into a holding tank and installed 13 gallon bladders in the spaces you describe under the port and starboard v-berth.
I cut out rather large openings on the two sides to facilitate installing the bladders and converting the tank. Then I cut "Flanges" out of plywood that are epoxied and screwed in place under the v-berth platform. These flanges are very strong and allowed me to reinstall the cutouts after the mods were done. The cutouts are screwed back in place but not epoxied so that I can pull them again if needed. I also removed the overboard through-hull and glassed it in. I really like having a 30-35 gallon holding tank. Rick Bushie Anchovy, '71 30-1 Tolchester, MD
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