The cutting edge aspect isn't the problem - In WW2, functionally all assembly was hand assembly, the difference between one production line and another was a matter of what parts were on it and what hand tools you gave the workers. The ideas were new and cutting edge, but the manufacturing was fundamentally 'Apply hand tool to simple metals', with some hand run wiring harnesses for a few motorized components. The Atomic bombs would have even been hand fitted and assembled. There's no amount of hand tools you can give a factory worker to allow them to build an ultraviolet lithography machine, which one singular firm in the world is currently capable of producing, that is a critical element in all modern chip fabrication processes that make up the electronic suites of all modern military hardware and guided weapon systems. The skills and talents required are not the sort that can simply be repurposed, a Tesla production line is not feasible to convert to production of armored fighting vehicles. Same goes for aircraft, there's no viable way to take a boing commercial airliner plant and start building out modern fighter craft. And that's assuming you also solve the bottlenecks of producing the engines, which are bottlenecked by advanced foundries capable of producing the exceedingly specific alloys required for jet turbines, which you can't really do in a repurposed steel mill. And machining these would require advanced, precise CnC machinery that is bottlenecked by the earlier chip manufacturing processes - its all interlinked, so it all has to be built up step by step.
Solving this logistical chain would take a decade of wartime production just to bootstrap up to meeting current domestic demand, much less wartime demand. Its simply not feasible at this time, and won't be feasible anytime in the future without a globalist collapse and decades of self reliance buildup in major countries, which is unlikely. This awareness is why so many countries are trying to develop stronger domestic industries of these things, they're reliant on far too few suppliers. Just look at what pandemic shipping disruptions have done to a peacetime, globally linked consumer economy.