The machinery and tooling likely does not exist. Tooling and machinery for many weapons systems were put into long term storage during and after the war, but as time progressed and the old weapons became even more obsolete the government purged the items in storage. As the tooling was cleaned out over time, eventually some of the storage sites were also sold off. I'd wager the tooling and machines that enabled allied victory in WWII has long since been sold off for scrap.
Some of it may still exist long forgotten in the back corner of storage site and factories, but those are the exception. Of course, I love hearing the anecdotes about long forgotten tools of war that are discovered in a warehouse or factory. A friend told me about the basements under the GM Hydramatic plant in Ypsilanti, MI. It was formerly the Ford B-24 Liberator bomber plant, the factory changed hands several times after the war, and many different things were produced after the war including M16A1's, C-119 aircraft, civilian autos, etc. up until it closed just a couple of years ago. Allegedly, there were thousands of square feet under the main plant where tooling and parts had been squirreled away for decades. He explored many different areas during his 25 years at Hydramatic. A lot of it was flooded, but areas that weren't had all kinds of neat stuff piled up including aircraft parts and WWII era tools and dies. Who knows what else. The site is currently undergoing environmental remediation and demolition. Thankfully part of the original plant will likely be saved for posterity, but the site was vast and will mostly be leveled.
