Thankfully Pete made me rethink just placing the plastic tanks into the hole that previously housed the aluminum water tanks. Pete's recommendation for building a support system was welcomed and I have taken some of the suggestions...
Using 3/4 marine plywood with supports under that tie to the engine room bulkhead forward and then to the aft cockpit support posts on the aft. Then, bolted in plywood "stoppers" inboard and outboard to keep the tanks stationary.
The 3/4 ply is just going to be enamel painted - not going as far as sheathing the ply in fiberglass.
You can get an idea of the arrangement from the pic...
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