Uhhh 1/2" off on measurement for stainless steel truss conveyor 4' x 5' x 80' long. Last minute switched to stainless and thickened structural members which added 1/4" material each side causing obstruction with bolts for the conveyor part(idle trolleys belts etc). I don't remember costs exactly but about $15k in material and at least that much in labor. PLUS times 2 because had to rebuild. So rough 3yr later estimate about $60k and almost lost job after. Not because of mistake because while managing the fabrication shop and designing the conveyor system. I had the shop lined up building the supports. Because in my logic the legs get install first then set the truss on top. I was going to finish drafting the truss system while shop building the legs. Boss/owner comes in showing his ass wanting conveyor/truss built bc job was late because the customer couldn't decide final elevation. I said ok, we're on it. He comes back 4 hours later and pitches a fit because I ignored him. He didn't consider the legs part of the conveyor. He insisted on us stopping immediately and starting the 80' truss disregarding my very stern objection that I had not finished drafting the truss. I was extremely concerned about the connection points lining up and never thought about the material change. Completely built bolts hit against an inside flange. Could have forced them, changed smaller bolts, offset everything 1", among few other suggestions. I went to office to figure out best course and come back owner has all the guys with torches and grinders cutting all the joints replace all Horizontal supports with longer. I explained the heat stress would ruin it. This conveyor spans 75' with walkway on both sides. The owner wouldn't back down. I told him I can't allow it. He blew the F up, cussing me, accused me of purposely messing them up, fighting against him, claims it was the only way so it was my fault. I told him if that truss gets shipped I'll call the general manager over the job, the customer, the customers engineering firm, OSHA, the police, and whoever would listen that you knowingly put them in danger. We were nose to nose red faced. Everyone thought I was fired. He started having chest pains went to hospital for heart attack but was fine. Still insisted on completely rebuilding truss instead of numerous easy fixes. And he set the wrong piece in the middle of the parking lot so EVERYONE would ask and he could tell the story about his smarty arty college edumacated "engineer's" fuck up. I lined up a "just in case" job the next day.

Tldr: yes that's one paragraph no formatting. Lucky it's not 1 long sentence.