I think the bigger issue is all the parts that we make currently for the production environment of cpus that use cpus in their production now. The cleanroom and robotic parts and such that would have to be made in old fashion ways and the whole process of finer and finer components that meet very specific tolerances and such. Like how advanced of parts can we make before we need vaccum tubes or such to make some machines to automate to a level to get an advanced enough part to make and integrated circuit.