Working Life is a monthly column in which Texans talk about their jobs. Mike Holt, who is 74, is an anaplastologist and owns ARTech Laboratory, a Midlothian workshop that creates custom silicone prostheses.I grew up in construction. My dad was a contractor, my grandfather was a contractor, I was a contractor. My brother was a contractor, until he went to work at the prosthetics company Life-Like Laboratories, in Dallas, and fell in love with anaplastology. He saw how meaningful it was to patients to have realistic limbs that helped them feel like themselves again. And there were not a lot of anaplastology labs, so we started our company in my garage in 1995, and we kept working together until my brother passed away in 2016. Now…