Good question... No idea about the same level, I reckon it would be decently quick (5 years maybe? less than a decade imo) if the right people are alive. If no

Good question... No idea about the same level, I reckon it would be decently quick (5 years maybe? less than a decade imo) if the right people are alive. If not, there's still knowledge of older, but decent processes like 130nm/90nm, which should be doable pretty fast...