I was poor when I was a kid and I took everything I had apart and put it back together, sometimes better, sometimes not. Dad used to make me try to build everything before he would buy one for me. Learn to weld built a bicycle... learned to bend plywood built skateboards... learn to frame built ramps for the things ... I learned to play guitar on a pawn shop Harmony Flying V and when it was time to upgrade I couldn't afford it so Dad said "Why not just build one". Ummm ok. Bought a copy of "Constructing a Solidbody Guitar" by Roger H. Siminoff and went to work. Then I spent all the money I had buying tools and wood some of which I still have. I built way more guitars from my $100.00 belt sander and $100.00 scroll saw than I ever could have purchased.
Then while in college I got a job as a luthier in a small shop that primarily worked on Brass and Wind instruments. That is when I actually got to the point where I could sell my creations.
Now I barely find enough time to build... man it was nice when I had no real responsibility.