The paint on that frame, though worn, looks really good. I agree with your idea to hold back on the polishing to leave a little patina.
Have now liberally applied x 3 Turtlewax to seal frame. Spent a few hours working on one of the (Campag)QR wheels that weren't on the bike but had been bought to be used with it. Wire wool for spokes and T Cut on the rims is working well. Both run true and are holding 80psi with no sign of serious defects so a bonus. Will initially run it with these as they are fitted with 5 speed. although I know they are a lot later but look the part.
Will also go with the Campag Gran Sport mech as everything I've read says the Benelux Mk7 was a nightmare and is confirmed by members on here.
White hoods(if i can get some that fit given the GB levers have adjustment wheels) or bare levers with white cables. Like the sound of red bar tape to tie in with the red of the frame. Looking for an old 'flick' type bell, in silver or red, metal toe clips and leather straps as old ones were past it and a 16 inch metal pump. I'm presuming I can use one of the NOS chains. Also 27.2 seat post. I know its a long shot but could anybody confirm seat post size? Old one was crushed so hard to gauge.