In Texas we always called them a panel van or panel delivery. You've done an awesome job on this. I have one I painted blue that is on the get-to-it list. You've inspired me. I'm gonna have to move it up in line!
What he says. Proper preparation prevents P-poor product. Get rid of seams and irregularities on everything. Prime everything it helps see mold lines, I use a Dupli-Color sandable spray can type then sand it smooth. #4 is great, the only thing I would add is to make a stand for the parts and buy some of those resealable plastic shoebox type bins. As soon as you are through painting, put the parts in one to dry. It helps keep dust off the fresh paint and minimizes the fumes when you bring the parts in to dry.
Thanks for the responses one and all. I have bought many a kit for that one particular part that I just had to have for a build. Usually it is tires and wheels. It just bothers some part of me to have a kit sitting around waiting to have its missing parts returned to it. It's like it is calling out to me! Lol. I just pictured those Rat Rod sets and the ones from the Midget racers and all the other cool ones Revell makes being a neat add on for the guy who goes in to buy a kit that he wants to do something different with.
I just figure they already have paid for the molds, so maybe they could get extra use out of them. Even when the original source kit isn't currently being produced, they could maybe pick up some more money on the wheels and tires. Plus it keeps guys like me coming back to the hobby shop.