Comment by killingtime74

If there's a budget available analysing that and what the biggest costs would yield the most accurate estimates.

Could be more but the biggest cost is probably labour and there are 2 indexes for that:

https://www.bls.gov/news.release/eci.nr0.htm

https://www.bls.gov/productivity/

Wages can be drilled down to the employee groups that would be predominant, such as machinists or engineers.

Productivity can approximate how much more efficient people are now due to technology.

Then major component costs can be compared from other current rockets vs historical costs.