There's Farmcraft101 if you are interested in DIY builds and repairs. There was a series of videos repairing an excavator from scrap to finish, and he is currently doing a series of videos adding hydro generation to a pond. Interesting metal fabrication, hydraulics, power, etc content.

Farmcraft101 is my absolute favorite channel right now. I can’t wait for fridays when he puts out a new video. I found him a couple of months ago and binge watched all his playlists.

That sounds pretty interest, I'll take a look!

Veritasium (https://www.youtube.com/veritasium) has well researched content, but they are broad in terms of their topic selection.

Real Engineering (https://www.youtube.com/@RealEngineering/videos) is focused on engineering, but more on specific vehicles or products than individual concepts.