I work a lot like Paul described above. I don’t worry to much about precise measurements and for duplicate parts it is just to shove it through machine set-ups and/or use actual parts to set the machines up for duplicates. This mostly involves fixed fence locations for widths, stops for lengths and angled set-up blanks for reproducing angles. A good example of this type thinking is my Christmas basket project. The sides on my plan call for 15 deg. but they can be any angle. The only important thing is that all four sides are the same angle. An angled auxiliary fence used to cut the sides insures that the angles will be identical.
Mike, an American living in Norway