Those early kits were pretty simple, just a few blocks and sheets of balsa and an instruction sheet. If you were lucky, there might be a couple plastic parts, like wheels. The Guillows stick and tissue kits are still being made.
I never mastered the art of making a plane that flew well. And, they didn't survive a hard bounce worth a darn. The big guys and adults would fly their U-control planes on the Jr. High field, and I'd go over and watch. Some of them were amazing. I built one gas powered plane. It didn't even make one circle before doing a loop and self destructing.
Real hobby shops are disappearing fast. I'm on a modeling forum, and I frequently see posts that so-and-so shop is closing. The internet is killing them, and kids don't seem to make stuff much anymore. It's mostly old guys like me who keep them going. Prices may be a factor. A Comet kit once cost 25 cents, and a tube of glue a dime. You'd pay about $30 for a similar Guillows kit now.
Craft stores seem to be doing well, and some of them sell a few plastic kits. But the selection is pretty poor. And, if you are looking for advice or help, forget it.
Don