You got 3 years on me and were in the heart of what we east coasters only read about in car mags or simulated at our workbenches. There are cars from that era that haunt me still ... one of the few customs at high school was a 50 Merc with all the standard stuff .. chopped, 53 Buick trim, cruiser skirts, 57 Packard tail lights, Blue with gold in the trim. That's where this 49 Merc on my table keeps heading.
I used articles in Car Craft and such to see how the body men sculpted steel and used their techniques on my models. I bent wire to the shape of some partsbox dual headlights to mold them into a 40 Ford fender. There were articles on every custom trick you could imagine.
Like you say, Dave, the aftermarket was Mom's sewing tin. I remember hot sewing needles as "drills" for plug threads and I'd stick the sewing thread end in glue for a stiff "spark plug". At least there was a proliferation of Hobby Shops back then. With all the options in kits, read 3 in 1, the supply of custom parts was pretty good. Somehow I always managed to be buying another kit when I had no source of income. Well, bleach bottles had a 2 cent refund!!