All cars are different, and a different approach for each one is therefore not unreasonable. I have just "restored" a 1973 Ford Mustang Mach 1 and I did struggle with the scope of the restoration. I wanted to keep it as original as possible but still look good, drive reliably and be comfortable. The changes to the car include wider wheels on magnum 500 steel chrome rims (originally it drove on cross plies .... you wouldn't want them would you?), wheel diameter, wheel rim size and ride height are unchanged, Koni shocks) electronic ignition, rear view camera, Recaro seats (I still have the originals), Momo steering wheel (I still have the original), lots of sound deadening, and new upholstery and paint (black and red instead of Light Bright Yellow and white respectively). Everything else is stock or replaced original. Fortunately, being 1973 vintage with a lot of options ticked, it already came with most of the things we now take for granted ... like seat belts (now replaced with retractables, sorry). I have seen wild restos and mods on these cars including engine bays better finished than the outside of my car and that's OK if you want that sort of thing but it is not my cup of tea and I believe it detracts from the original intent of the car - to be driven. I think that the more exclusive and rare the car is, the more important it is to keep it original or as close as possible, but in reality where would you find someone who could give your car a baked enamel paint job? Some common sense must prevail. Anyway, if we all wanted the same thing being a restoration, restomod or u*********, life would be dull. They may only be original once, but bear in mind that when they rolled off the showroom floor they were new, not 20 year old worn out wrecks. Anyway, I have attached a photo of the end result.