I'm trying to come up with an approach for this. It's a stainless steel weldment, about 12" long x 6" wide. I will need to put in the 3.5" hole on each end, starting from solid. The hole size tolerance is .001" total and the two need to be located within .0002" of each other on center. I'm thinking I can rough one hole, flip the part, rough the other, then in the same setup run a long boring head through both sides. Is there a better way? Or am I better off getting this ground to size? 2 tenths seems awful tight even in a rigid setup.