Thanks, Arch. That's the sort of material that I would expect to see from the factory. I picture a timber like that flush at the top of the stringers with a couple of angled blocks wedged in under that, and tabbed in on the side that is facing the bilge. Just a couple of tabs in front where the floor hides it.
I'm starting to get some ideas on how I can create it from layers of plywood.
I want good support, but I also want great drainage from the ski locker all the way to the bilge. My replacement tank is shallower, but longer than the original. That will allow me to suspend it above the hull about an inch. My goal is to be able to rinse it from ski locker to bilge with a hose if I want to. That should prevent leaves from blocking the drain passages. That should also allow that section to dry, especially considering that the area at the back where the tank ports are will be open and accessible when the engine cover is open. That's how the factory did it, and I like that access for inspection and airflow.
