Bones, the width of the former, there where the wing LE would butt up to is 8 7/8 inch. So when the two sheets of 1/8th inch sheeting are put on in that area, outside dimensions would be 9 1/8 inch. That is outside to outside. Paint to paint. Inside sheeting max is 8 7/8 inch.
I think this is what you wanted. If not I'll try again.
Rich