Tour Portland’s metalworking companies and you’ll find factory yards literally shuddering with roaring engines. Elephantine cranes throw around junked cars as casually as a child tosses a toy, and massive dump trucks loaded with tons of jagged, rusted steel scrap rumble past on tires taller than a man. Welders wearing masks and fireproof coats burn imperfections off of freshly cast backhoe teeth. Day shift, swing shift, graveyard…the production never stops. Portland’s Harbor I...