A Vallejo startup manufacturer of modular classrooms designed to be sturdy enough to relocate multiple times and stack a few stories high on April 9 announced it landed $11 million in funding. The series A round led by Goldman Sachs Urban Investment Group will help iMod Structures, formerly Intermodal Structures, finish outfitting a former Mare Island Naval Shipyard factory and ramp up staff, according to iMod co-founder Craig Severance. The company employs less than 20 now, mostly on the factory floor, but the goal is to hire 50-75 locally in the next 12 months.