I don't believe for a second that modern automotice production can easily be changed into manufacturing anything besides consumer grade vehicles. Auto plants aren't full of generalized lathes and mills anymore and a large part of their supply chain is based in smaller factories making the the more complicated parts. It takes them up to two years just to switch from one consumer vehicle to another, not to mention a completely new vehicle unlike anything that has been built in those plants for over 80 years if ever.