Bill-I had to do a Google search to see what the Grande option was-looks like the body was a notchback rather than a fastback. All of the kits I'm familiar-Revell, Monogram, AMT & MPC-are all fastbacks.
I'm not an expert by any means-hopefully someone here will have a source for a kit or for a resin body.
Good luck-it's a nice thing you are wanting to do.