The overhang is highlighted in black.
My solution is similar to hondamatics, cut the firewall away from the body on one side which allows you so spread the body slightly to meet the roof.
Been spending some time recently getting caught up on this board. I found your "in progress" build thread, and glad to have now found that it did get finished. Nice tribute to a great builder.
Cool build. I've gotten one of these out of the box and just never was happy with what i started. i guess the key might be bigger wheels. You nailed. it.