https://www.youtube.com/c/ThrottleStopGarage/videos is Throttle Stop Garage, a guy in Canada building a heavily modified Volvo 122. If you're interested in how to make carbon fiber parts he goes into great detail, plus there's also a lot of welding fabrication.
https://www.youtube.com/channel/UCaIIoFbVqP6NNF78iit5-Xg Is Irontrap Garage, a guy in Pennsylvania who's into traditional hot rods, there's plenty of welding, sheet metal forming for rust repair and general fabrication.
https://www.youtube.com/c/SuperfastMatt/videos is Superfast Matt, he's putting a Tesla model 3 drivetrain underneath a 1950 Jaguar saloon.
https://www.youtube.com/user/Squatch253/videos is Squatch253 a Ford mechanic in Minnesota. he rarely does anything automotive on his channel, but he goes into intricate detail of the restoration of old tractors and Caterpillar crawlers.
https://www.youtube.com/user/retropowercars/videos is Retropower, a shop in the UK that builds very cool restomods, including a Ford Escort for Sir Gordan Murray.
https://www.youtube.com/channel/UCsAaakmE0dAtG7AVFb7oUEA is the personal channel of Lucky Costa, the host of Hot Rod Garage on the Motor Trend Network. He builds a lot of muscle cars and trucks for clients.
https://www.youtube.com/c/RonCovell/videos is Ron Covell, master metal shaper.
https://www.youtube.com/channel/UC2pQT90JBqbMHSVLtbJBvyw is Tyrell's Classic Workshop in the UK, they repair and restore exotics.
https://www.youtube.com/c/Harrysgarage/videos is Harry Metcalf, former editor of Evo magazine in the UK. He has an amazing personal car and motorcycle collection, and also does reviews of lots of interesting new and used exotics. His second channel Harry's Farm is interesting as well.
https://www.youtube.com/channel/UCl9I7RgD0i7JZ58CK17kKHQ is Soup Classic Motoring, a guy in Ireland who's slowly restoring a Lotus Esprit along with a Range Rover and a Mercedes saloon.
https://www.youtube.com/c/fanatikbuilds/videos is Fanatik Builds, a young guy and his dad building a restomod Triumph GT6 with a crazy combination of engine, transmission and suspension donors.
https://www.youtube.com/c/MacroMachines/videos is Macromachines, a college student hand building a replica of a 1930s era Indy race car.