Very interesting article. Thanks for posting. I started with the Comet kits. Cutting out the parts was always a challenge especially with only a single edge razor blade. The part I dreaded was cutting the 1/16 inch square notches especially the ones that ran with the grain. The kits taught me patience, persistence, that my model never looked as good as the picture and they never flew like I expected. I guess that is really quite a lot to learn for a dime.
I remember the first kit that I ever got that was actually "die cut" as opposed to being die mashed. It was a Carl Goldberg kit. I recently built a Brodak 38 Special. They take die cutting to a new level.