Interior pieces will be tough, door panels, dash pads, etc. Front aluminum trim parts might be spendy if you need them.
I sold a 1968 S code GT Cyclone project car to a friend. He still has it.
Has bucket seats, console, automatic, with power windows. White with red interior, spent its whole life in SoCal. Solid car, engine frozen, missing smog and Holley carburetor.
He and I were at a you-pull-it yard a few years ago. Found a 1968 Montego Brougham 4 door. Bought an excellent hood, fenders, and dash face (not pad) from that car. There might have been a grille and front bumper too.
I think that you would be money ahead to buy a 'done' car.