For me, the shop is my time. I'm a constant problem solver and I was born to be an engineer. In my work life, I solve issues, but they are big, nebulous things that don't have a single solution. They have shades of gray, risk, and PDCA cycles. Its very dissatisfying. I like to arrive at a concrete solution, like solving a math problem.
When I'm home, and building something with my hands, whether that is the Jeep, a woodworking project, some sort of Bicycle project or any number of other little things that occupy my mind, I'm at peace. I don't need music, or TV. I don't need people. I lose myself in the task at hand. The trouble and stress of running and owning a company mostly washes away and I get to focus. Its SO damn satisfying to put something together, restore an old piece of equipment, fix something broken, etc.
When its something that someone cast away as garbage and I see value in, the process is even more satisfying. Bringing that value back is one of my biggest sources of pride and motivation. I think that is why I'm drawn to things like my 78 GMC, an "old" Jeep, and old simplicity tractors. I also love finding old wood and creating something beautiful, worm marks and all.