I am slipping my boat for antifouling and to do some work on it.
One thing I have found is that at least one of the old Gal tube ribs has rusted away at the bilge end, leaving an empty cocoon of FB.

I have been warned that if the ribs get too bad the keel can come loose due to the excess flex in the hull!

I want to replace this with wood and glass over it. Thought this would be easier and quicker. But maybe not as stiff as gal pipe.

Given the shape it has to be. I am thinking marine ply. I would laminate 2, 16mm pieces together and then cut the shape out of it. Maybe 50mm high. Round the top edges. Then a heap of glass for added strength.

Any advice would be great.

Thanks in advance.