AUGUSTA — Over the sounds of welding torches, hammers and robotic lifts, Jackson Fortin talked Friday about what he hopes will be a promising career of building houses. Fortin, a junior at the Mid-Maine Technical Center in Waterville, was one of more than 1,200 students at the 18th Annual Crafts Championships at the Augusta Civic Center. “I really like construction, so the nailing stations and doing measurements are my favorite,” Fortin said.