Now this one is going to be interesting. I am a Cadillac nut, having built quite, a few, and having several in the queue to be finished. I have included photos of kits that could be used to do the car. Looking at the black and white photo that Ron Gross posted, the main body is a '65-66 Deville Convertible
, but in the color photos, one side shows a '67-8 Sedan De Ville, and the other side a '67-8 Coupe de Ville, with the sail panels and doors from each,
the hood from a '71-6 Eldorado , the left rear fender tip from a '67-8 Eldorado , The left front fender and left rear bumper tip from a '63-4 right side bumper tip, the trunk and right fender from a '63 De Ville (no pics). The rest of the car seems to be from mid 50's Cadillacs, and other custom parts. An exact replica of this one would be truly time and labor intensive, and truly expensive, but the way you are approaching it will give the essence of the real car, and could be quite interesting. Go for it!!!