I try never to fall below $120/hr for shop time, and if I can accomplish that through margin and labor, I'll go that far. I hate to use raw material costs as a benchmark, because my cheapest raw material (1/8" birch ply) pays the highest profits. I get $2.50/min for airplane parts and can sit there for hours doing it. (each shipset will feed 450-500 minutes of labor time)