Graham just took a close look this has an 1/8" battery tray very well secured that could just be doubled and glued it then would only require a cut back
of about an inch ( slotted for the engine) and a false firewall cut in half glued in under and over it behind the engine would really beef it up, the original
fire wall could be cut leaving a perimeter edge of about 1/4 inch all around the battery tray is structual thats what gave me the thought martin