50 years is optimistic. The equipment needed for vacuum, plasma sputtering, and masking hasn't changed much in the past 50 years. Sure, if you want to make a

50 years is optimistic. The equipment needed for vacuum, plasma sputtering, and masking hasn't changed much in the past 50 years. Sure, if you want to make a 1 um process you can do that with a purchased wafer, some chemicals, and a spin plate. If you want to make a nm-scale process you'll need to have a serious budget.