For Nut and Bolt Restorations: ALCARLA TECHNOLOGY SPAIN

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While YouTube has more car restorer videos that you can shake a stick at you might just try ALCARLA TECHNOLOGY  from Catalan in Spain. 

Father and Son outfit with workshops that look like operating theaters.   Doesn't matter what car is being overhauled the same process follows if it is a full nut and bolt restoration. Moreover it takes in cars from all around the world.   E.G    a F1 racing driver from Monaco had his Ferrari F355 sent to them if you want a taste of how they restored the car.    Equally they did the same thing to a Vespa Scooter to as new condition.   An old Mercedes 450 SEL was also worth a look from the Far East     Costs must be astronomical but the  filming is first class and also the music they overlay on the videos.