The 56 Chrysler is a cool looking car. I became custodian of three of these little gems a number of years ago. There is a Chrysler, a Buick, an Olds and one other that I cant remember. They are all cool and quite detailed especially for 1/32 scale
I am liking it
I like the idea of lengthening the door because although the Tudor doors are long they seem to end up looking short when the top is whacked and the proportions look so much better.
The other issue as I see the kit grill compared to the 1:1 is the grille surround looks a little heavy. You could thin than down a bit and add some stock to the inner side and open that out like you already have done. The grille opening would also then need filling in to fit the reshaped grille.
I must dig one out of the stash and have a look or just rehash the built up
And yep there definitely some Fisher-Price elements to the kit such as the already mentioned rear end and also the gearbox leave a lot to be desired. The headers hang a little low too
"I also glued a piece of white plastic to the rear corner And sanded it down with a file and sandpapers. Got it pretty good" - I had the same issue with my build - see current thread
You are doing an nice job and the paint is looking good
This an excellent build of the Plymouth coupe.
Have you tried spark plug wire for the welting. It is usually 0.4mm (0.015"). Typically the real thing is about 5mm diameter so 0.5mm would be correct but may still look a little large but 0.4mm plug wire woud be sweet with paint on it.