My father-in-law was a boat builder and restorer. He's senile now and can't remember much. We're cleaning out his shop. Anybody have any idea what this is? It's newer construction and very heavy. 197 1/2" long, 34" wide at the middle-top. 18" deep. Raised platform on top is 4 1/2" high by 10" wide. Getting rid of a lot of his stuff. This was stored with older canvas-over-wood canoes.