On the real Javelins, the cars after 71 all share the same doors and windsheilds of the 68-70 models. You can actually interchange the front fenders...they will bolt up. I seen a 69 with humped fenders cruising around town.
About brush painting...are you using a cheap hobby shop brush? Get the best quality you can afford to buy. Also maybe thinning the paint will help the paint lay smooth. Testor's bottle paints can be on the thick side if you are using the small glass (plastic?) bottles. Also one smoothly applied row (slightly overlapped) of paint at a time. Do not try and go over the paint again as it will get uneven.
My Dad's car was a Studebaker from 1949. He dated mom with this and traveled a couple hundred miles to meat the parents. Mom was living in Milwaukee and she was from the central part of Wisconsin. One time up on the farm, dad was "was pitching woo" and nine months later.... After that Dad had a 49 Ford and then the car I remember more clearly was a 54 Ford with the flat head six. I think I was in second grade when he bought a 58 Rambler four door sedan with the V8. Nice car. After third grade I was being raised by my Grandparents while my sisters stayed with mom. Grandfather has a series of Buicks from a 1956 Special to a 1960 LeSabre, then a 1969 Skylark Custom he had beefed up to GS specs by the dealer who was a friend of his...after that a bunch more Buicks, a 75 Special, 76 Lesabre, 77 Lesabre, 84 LeSabre to the last one which was a grand National.
I went to Model Empire yesterday just to see what was in. I went through the vintage kit section and found a 1/32nd scale All Star series 60 Thunderbird. With my luck Round 2 will now re release that old kit. Looking for the others.
Model Empire had their yearly rummage-o-models yesterday. I picked up a Monogram Cord and a 1/32 scale early Chevy with actual chrome bits. Some head lamp lenses and wheel covers for Fords. Some tires to complete a few kits I bought years back that had none. Also the July issue of Model Cars.
Interesting stories, people. Another one I have is the guy selling the Toyota 2000 GT convertible from the Bond movie. MPC or AMT, I forget which. He wanted $80 for it but had no chrome, was a glue bomb too. Same show, I find another in mint condition for my haggled down price of $50. And his started at $75. The other guy is still toting that glu bomb from show to show, each time with one more missing part it seems.
I was at our model car club meeting and bought a Challenger (modern) 10 bux and a petty Plymouth from Lindberg at $10, and five bucks worth of raffle tickets netted me the Starsky Torino and a Stooges Willys Gasser. $25 got me an arm load...plus a sheet of DOH decals...yeeehhaaawwwww.
I don't think it's rare, well at least not as rare as the stock version of the car which is very expensive. I've seen the race car for as little as 10 dollars. He did have it marked at $35, but I haggled to $28. All and all, we had some fun digging at each other.
My kits fair well in the garage. I live in Wisconsin where we can have temps from 20 below zero to 100 degrees. The only thing I would say is wrap tires in paper toweling to keep them from reacting with the styrene in vintage kits. I am not sure how modern tire formulations react, but I take no chances.