Here is a build I completed a couple months ago. I started with the Revell kit and the Greg Wann resin body.
The resin body and the kit went together like a hand in a glove. I changed a few things, like the wheels and brakes from a Revell Saleen Speedster kit, seats from the 1:24 Revell 1993 Mustang Cobra kit. (Which fit really nice) I modified the engine compartment a little and added the Manifold, heads and headers from the '93 Cobra kit.
I added the strut tower brace from a late model Mustang kit and added an aluminum radiator from my parts box.
I put together an exhaust system from parts box parts. I made upper and lower control arms for the rear axle from scratch. Added sub frame connectors made from scrap styrene.
I cut the middle out of the resin hood and added the middle, but slightly bigger, part of the plastic kit hood to make a scale 2" cowl induction hood.
Everything that came with the resin body is shown in the last picture. All the parts are nicely cast, nice and crisp detail, smooth finish.