As a kid, I got the occasional car, tank or plane kit along with Tinker Toys and Lincoln Logs so I had a childhood full of "things to put together". High school was the muscle car era and I had enough disposable income to afford getting a car kit and some spray cans every few months. After college, came my first "real" airbrush, a compressor, and tools. I've done cars, tanks, and ships but planes always held the most interest to me. Here is part of the paper stash.
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Also mags
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So I've always been interested in how things work and when holding a 3D representation of something, you really get a good idea of how all the parts go together. And the planes and cars are colorful and different. When I was building the cars, some of them got pretty wild paint schemes. It's an indoor hobby that doesn't cost me a lot and I'm not into sports so there is a block of time to be used. There is a lot of satisfaction in creating something that looks fairly complex, but is just a number of "relatively" simple steps.