So what was the product out of the Flint Pilot line? I'm guessing this is where the clay and wood mockups and models became one or more hand assembled steel "cars".
Where did the parts that the assembly plants got to run down the line come from, or did they get some kind of partial assembly from the flint pilot plant?
I believe your assumption of the hand assembled steel "cars" is probably correct.
It's interesting to note that between 1959 and the Firebird clays approx 10 years the number of processes aided by computers jumped significantly.
Does GM still have all those tapes?
They stated any drawing could be produced from the tapes for any part in side top obliques etc.