Great looking builds and the kind that make me smile. The old guy in the roadster even has my beard and hair style. The trashy looking Flintstones are also special.
Before I spent a $100.00 on anything, let alone a picture of an old model kit, I would want to touch it, feel it, even smell it. Just too many horror stories of the kit not being what was presented in the picture online.
You might want to consider using an automotive self-etching type of primer as a base. Then use the Tamiya primer for sanding and a good smooth surface for the color coats.
Seems like anything having to do with our health, and Dentistry is no different, just cost a lot of money. I had a crown breakup just eating some breakfast sausage one morning and that was almost $500.00. The crown was less than 10 years old. I don't know how long these things are supposed to last, but for the price I was expecting longer than that. I have a crown on one of my front teeth on my lower jaw that has the same crown for many years. It was first done in my teens after a difference of opinion with someone else.
Beautiful looking paint and trim. Like the wheels and tires. The real '60 Plymouths weren't the most attractive looking cars but your version of it looks great.