Just from my experiences:
Due to squeezing every possible second out of a "launch timeline", we have NEVER had a Run at Rate done until after PPAP approval. Typically, there is a ramp up to get to full volumes for a new product and our SQEs don't wish to perform the RandR until we're ready to meet full volume expectations.
Stew - As a "prototype house" why would you be doing Run at Rates (a production requirement)
Bill