Trouble is you are trying to shave money off the sticker price when the car model hasn't been designed and built yet.
It is Boeing we are talking about here and not a Mini
( which in case you didn't know, the price set when it came out was a figment of the manufacturers chairmans imagination and took no notice of costing and materials, he just said we will price it at this to go up against the Ford Anglia..
Ford bought one, stripped it down to the core parts and priced it up at rock bottom and even they couldn't build a Mini for what it was selling for. They lost on every car they sold at the start.... Here endeth the history lesson.)