The Clickspring guy points out that there are no "absolute measurements" in his work. For years now, he's been hand-building an ancient Greek Antikythera Mechanism just to eyeballing it

https://youtu.be/xwmxmUNA7Pw?si=NHFPAaes90hy4ea9

The Antikythera Mechanism Episode 12, Part 2 - Making The Lunar Phase Display "Pipe" and "Cheeks"

YouTube
@bruces I just watched this last night, I’ve been following this build from the beginning. Utterly fascinating in all respects.
@bruces great project and so in depth that i seem to recall there was a big gap in the project videos because of his coauthorship of scientific research about the mechanism stemming, in part at least, his work building it.
@bruces an epic video series; hard to believe how much work and time he's put into it. The cherry on top was when he coauthored a paper on a new interpretation of part of the artifact: https://bhi.co.uk/by-the-light-of-the-moon-a-lunar-calendar-on-the-antikythera-mechanism/
By the Light of the Moon: A Lunar Calendar on the Antikythera Mechanism. Research by Clickspring. : British Horological Institute

Established in 1858 to promote horology, the British Horological Institute's prime purpose today is to provide education.

@bruces I mean inasmuch as the device is basically a geometric proof made out of brass, that makes sense. You only need relative measurements for that thing. It'll work the same way no matter the scale factor.
@bruces I've been watching that build for quite some time. Respectfully, classifying that as "eyeballing it" doesn't give credit to the amount of skill and relative measurement happening there.