The '62s I remember usually had the insert painted white or black. Some were tied to the interior color. If you use a lighter color as an accent in the interior you could also add it to the insert. Just a thought.
I have many built and unbuilt kits going back for over 40 years. Most of the issues I have experienced is heat related. It seams that the biggest problems have come from the tires. They seem to leave marks on anything they come in contact with while in storage. They have left marks on bodies and decals are the worst things to worry about. Some of the early builds I have had the tires come off the rims and leave some nasty marks in the paint and even the bodies in some cases. Your idea of using the display cases will go a long way. One thing I have found that has seamed to help is to wrap the model in a soft paper towels before placing them in a case. This will help to protect the model from bouncing around inside the case. I think heat and humidity will be your biggest challenges. If at all possible you should try to store your models in the most temperate part of your home.
I have both bought and sold kits at a few shows. Prices are all over the map, and I really look close at anything that has been opened. I have to agree that an older sealed kit will lose value if it is opened for inspection. I think if the seller is paid first with the understanding that if the kit inside is defective the price could be renegotiated. Another thing that I have been unable to understand is buyers who will look at and buy a built kit that needs a complete rebuild, has parts missing and looks like it has been dropped and I'm selling the exact same kit new in the box for the same money, what are they thinking ? In the end I guess it's worth what someone is willing to pay.
Robert asked the question on the carb. The '57 supercharger and duel quad engines used the '56 style carbs. They were known for floats that would hang up and flood the engine thus gaining the reputation of being called the "Towering Infernos". But that was what Ford used. If you got a '57 with a single 4 barrel it was the Holly with front and rear float bowls. I think that because the Holly was a longer carb. they couldn't use it for these applications.
Steven, I built the '56 delivery about a year ago. Used the '56 Nomad for a downer. The resin body only needed a little grinding inside the body in the rear for the interior to fit, no more than you would expect on any resin body. It builds up great. The only in accuracy is under the tail lights and the rear tailgate emblems. It has the emblems from the Nomad it is based on. The delivery would not of had "V-8" emblems under the tail lights and the very small Chevrolet emblem under the tails gate handle would have been larger and mounted lower on the gate. Modelhaus is down for several weeks so it might take a while.
Jonathan, Great job on the convertible. I did this several years ago to replicate a '57 Ford Convertible that I had in my youth. You should save the top, and I hope you cut it all the way to the base on the "C" pillar. I had saved this top and used it on a Revell '57 tudor to make it a hardtop. As you may know the hardtop roof line is lower and flatter than the tudor. The rear glass even fits the Revell kits rear opening. I like the colors you picked.
Ray, As you are getting ready to foil, I don't know what you have in mind for the side trim. The factory trim on the sides between the upper and lower moldings was a gold colored aluminum sheet held in place by the moldings. Think of the '57 Bel Air Chevrolet insert on the rear quarters. I have used Bare-Metal gold foil in the past for this. Many years ago when guys were modifying their 1:1 '57 Fords it was common to remove the gold insets as it was some what out of style. It was common to paint that area in a color that tied to the interior on solid color cars. Some would use it as part of the tutone effect. Often the upper molding was removed all together just leaving the one larger side molding by its self. I like the paint treatment on the forward part of the roof. What did you do there ?