Matthias Wandel's channel is a true YouTube goldmine. My favorites of his are the DIY woodworking machinery videos, featuring things like making a table saw from scratch, without a table saw.
For people interested in this stuff who haven't seen Next Level Carpentry, I highly recommend it: https://www.youtube.com/channel/UCXRNHTVpEdhz9BIvomETGiQ.
Also fascinating are the many videos about making and using pantorouters, a very versatile machine of his own invention: https://www.youtube.com/watch?v=J_72hOY2vPg (see video description, and there are older videos of different models too).
He sells plans for many things he's made on his website.
Also:
"Actually, I did use a table saw to square up some of the pieces."