I DID LIGHTEN THE FRAMEWORK AND DID REPLACE MOST OF THE ORIGINAL PLYWOOD WITH BIRCH PLYWOOD I DID NOT WIDEN THE TUNNELL I HAD ALREADY STARTED ASSEMBLY WHEN I READ ABOUT SOME OF THE MODS. I DID SHORTEN THE REAR SECTION OF THE COWLING TO ACOMMODATE THE PIPE.
THANK YOU FOR YOUR REPLY I WILL TRY...