Just got this. Apparently Shell Lake liked the Thompson tags too!
HI Brian, The plate says: Manufactured by Shell Lake Boat Co.
Shell Lake, Wis
There's a serial number on the wood that goes down the center of the floorboards, near the front. 116 349.
We are not sure what the outer cover is. My dad bought it used in the forties and he didn't do anything to it, as far as I know. You probably should see it yourself to decide Don't know when fiberglass came into use. Judy and Dave
Dan - Were they poorly made or are you just saying nobody wants to pay a grand for raw materials for a project?