I didn't see this - sorry I didn't respond earlier.
I don't have an example prototype control plan but it is simply customer requirements (if any) and your 'obvious' requirements. Your
FMEA will (should) feed in any 'extra' items.
I have seen a number of protoptype control plans and some are real basic while in some cases the stuff that was on the prototype control plan was the same stuff (and no more) that made up the production control plan. Don't get too excited about the stages.
Remember - each of the 3 stages is just a snapshot of the control plan as it was in a certain stage. It's
one document which is being developed/evolved - not 3 separate documents. You should have your revisions as a history file. And you may have more than 3 revisions.