> The world's last remaining whaling ship the Charles W Morgan, took 7 months to build in 1841 but 5 years to restore in 2008-2013 using the original shipbuilding tools and techniques (when possible).

I'm not sure that's great evidence.

Working with a historical artifact means you have to be more careful - it's more museum curation than construction. It's also generally slower to take something apart and rebuild it than to just put it together the first time.