Iterative alignment and using XactMeasure

Yes, this was my original question/problem. How do you translate (origin) to my datum "A" for the Iterative alignment (if you can't determine the value), or define this irregular shape for Exactmeasure so that my dimensions for my true positions are the basic dimensions from the print. This is what my customer wants, and since the customer is always right, I came here for advice. It seems a lot of people want to give me answers not totally understanding what i'm up against. Maybe people jumped in before reading everything on this thread, I don't know. What I've done (I've stated this in a prior post) is put three auto vector points on approximately the three high spots of datum "A" (like if you set it down on a datum simulator surface i.e.surface plate) then constructed a plane out of those three points. Called that plane datum "A" and measured it in Exactmeasure. Voila, I didn't have to use an Iterative alignment, because that wouldn't work for my situation. I understand everything everyone is telling me, and I really do appreciate that,(except the few people that want to criticize and belittle people) I just don't think they understand what I'm telling them or trying to explain to them.

Yes, this was my original question/problem. How do you translate (origin) to my datum "A" for the Iterative alignment (if you can't determine the value), or define this irregular shape for Exactmeasure so that my dimensions for my true positions are the basic dimensions from the print. This is what my customer wants, and since the customer is always right, I came here for advice. It seems a lot of people want to give me answers not totally understanding what i'm up against. Maybe people jumped in before reading everything on this thread, I don't know. What I've done (I've stated this in a prior post) is put three auto vector points on approximately the three high spots of datum "A" (like if you set it down on a datum simulator surface i.e.surface plate) then constructed a plane out of those three points. Called that plane datum "A" and measured it in Exactmeasure. Voila, I didn't have to use an Iterative alignment, because that wouldn't work for my situation. I understand everything everyone is telling me, and I really do appreciate that,(except the few people that want to criticize and belittle people) I just don't think they understand what I'm telling them or trying to explain to them.