I think the guy that designed that, used to drop into our shop and expect us to do far worse than that at times...
Nothing quite like being handed an envelope with 20+ 2x2 Post-It pages, each covered in detailed, carefully dimensioned drawings of the two dozen pieces that were expected to be MIG welded together to make up the assembly... Not terrible, until you see that he truly expects +/- a thou, on parts that are smaller than the weld bead will be. . . . . ... <UGH!>