I once came very close to buying a 50' Roger Simpson strip planked catamaran. One of the things I loved about it was the way the interior showed the cedar through the fiberglass. 

I did a quick google and I have been unable to find a comparison of cedar strip vs foam on a cost and weight basis.

Note: I am not talking about traditional cedar strip boatbuilding; I am still interested in making flat panels, but out of cedar instead of foam.

I was thinking that perhaps this would be cost effective in areas which might otherwise require thick foam, such as the deck over a bunk, or the cockpit floor. The price of foam seems to go up linearly with thickness, so a 4'x8'x1" sheet of corecell runs over $300 US. Could I accomplish the same thing cheaper and more attractively with cedar and fiberglass for a 4'x8' cockpit floor?

- Gardner