Haines High School senior Jordan Badger is building a 17-foot aluminum jet boat using a design crafted for local river conditions that’s inspired more than a dozen other vessels.

“We’ve always wanted a river boat. I enjoy welding, so it was something I wanted to try,” said Badger, 17, who’s building the craft in the school’s auto shop with help from dad Brad Badger.

Sheets of eighth-inch aluminum in one week have become a recognizable…