An overlap of the two obsessions: recreate something historical with only the tools available at the time.

Clickspring's ongoing recreation of the ancient Greek Antikythera mechanism, starting by recreating many of the original tools likely used to build it historically (and contributing to academic research on the details of the system as he goes along!), is an incredible example of this (and altogether an amazing channel): https://www.youtube.com/playlist?list=PLZioPDnFPNsHnyxfygxA0...