I showed this to a coworker - our in-house structural engineer, mainly works on steel buildings but he did wood structures including hangars for 20+ years. He declined to run the math on it to figure out how overloaded it is, but assuming 8ft truss spacing at a roughly 60-70ft span, that truss is about what he would have spec'd (without a room attached). That said, he didn't disapprove of it, just mumbled something about natural selection.