Plan to transplant the 53 body onto the 54 frame and use the best fenders and doors between the two to complete it. The 54' has no frame rust to worry about but disassembled and not running. The engine, transmission and breaks were rebuilt before it went into storage. I have everything including head liner wires. The trim is a complete set for a Star Chieftain, I have all the chrome, rear wheel cover, hub caps, window cranks, on and on, everything. Plus red vinyl reupholstered seats. All windows are accounted for but a couples are cracked including the front window. It has a California title. Photos of the disassembly process can be provided if desired and the Pontiac factory maintenance book and 54 Chiltons guide.
The 53' is also complete but not running. Without this car you can't build on the 54's good frame and suspension etc. The chrome on the 53 is also very nice so, as the bodies are the same, you could build either car and sell the others parts. It has a California title.
In the picture of the red reupholstered seats the folding back rest and bench seat are sitting on the front seat bench with attached back rest.