Kenat,
I am familiar with targets, however if I pick the cover flat bottom as primary, and define 2 planes using 2 surfs at 90 deg's to each other from the outside walls, then my DRF origin isnt at the center of the part, but at a corner which defeats my intent of center relating features based on functionality.
I had been thinking that if I did use targets, that the part (which is 20mm deep) with a 2deg draft (as modeled) the difference between the bottom edge (start of draft) to top edge (end of draft) is approx. 4.5mm. If I use a target point (e.g. A3) inset from the bottom targets (e.g. A1 &A2) by the 4.5mm to establish the primary Datum; then if the part comes in with minimum draft (e.g. .5 deg) the part orientation when placed against the targets could hose up good dimensions. Comments?