I bought this boat about three month ago and I knew of this problem and i plan on fixing it now. I have taken it on the water multiple time and i dont see the transom flexing or acting like its flimsy. The transom has one small peice of plywood the aluminum hull then another peice of plywood...
I bought it back in january or so and i would like to know as much as possible about it. I have heard it is a sears but its from the 1960s so that is all i know.
Here are pictures.
http://img693.imageshack.us/i/44889849.jpg/
http://img257.imageshack.us/i/32543754.jpg/