Depending on the needs of the part hole location requirements, you would
need to dimension the x,y,z location of the 'pierce point' of the hole
on the face, and then provide dimensions as needed to find this point,
and make the assumption that the hole axis is normal to the piercing
face.
Thinking of the part the way a Machinist on a Bridgeport Mill would see
it, you may need several aux views, one for each facet face that has a
hole in it showing the location of this hole as seen straight on to some
other features, edges... On really complicated fixtures with compound
features, I would show the location of a gage ball on a stick (common
carr-lane item) to generic hole in the part, and dimension all features
to this.
Too bad you can't show us an example of what the part looks like. Might
be fun to dimension. (BTW, I have a strange idea of 'fun')
Christopher F. Gosnell
FPD Company
124 Hidden Valley Road
McMurray, PA 15317