The only major difference I see between my stock F100 body on my real truck and the Foose body is the way the cowl is flat from the hood edge to the bottom of the windshield on the Foose body, where the real body curves upward an inch or so under the windshield. I adjusted for that difference by laying out the lower windshield trim a shade above where Revell put it, I will soften the curve under my windshield a bit more at some point so it more closely resembles the real truck. Also, I used the AMT firewall instead of Revell's because it is way closer to the real deal.
BTW the windshield, and window trim was made from aluminum bead wire flattened a bit by rolling an Exacto knife handle over it. The idea is that when I get ready to put the final coats of paint on, I will file\sand the aluminum down until it is slightly above the body lines around it, When I polish the paint I hope to have polished "stainless" trim as well. Time will tell if this will work.