Mountain Scene By GUY WILLIAMS A Queenstown carpenter’s transforming his body for the challenge of his life. Stefan Heinrich says he ‘‘caught the bug’’ when he ran the 15km Miners Trail at last year’s Motatapu multisport event, and decided to give himself a bigger challenge. The keen outdoorsman decided he’d prefer to run in the backcountry than on roads, so decided to give the 52.5km ultra run a crack. The 30-year-old Englishman began training in earnest in October, going on solo training runs that he’s stretched out to four hours in length so far. He’ll ramp those up to eight hours as race day on March 6 approaches, which is about how long he hopes it will take him to finish.