Thank you thelews for the rec - Don Drabik and his son Scott looked over the car for me and spent nearly 2 hours at it according to the dealer.
They have given me a lot of details and sent a couple of initial pictures before sending a full report.
Overall when I asked Don if it was a car he would walk away from or buy, he said, buy.
As we had all noted the front fenders have been replaced, however he judged this was a very long time ago possibly when still in Germany in '81. He thought the inner wings were likely original and it turned out that what we all thought might be rust on the drivers side inner was some kind of very old bondo like material that had been thinly spread inside he thought to maybe cover some of the welding, He didn't think there is rust in the fenders and that they were entirely solid though obviously not done to any restoration standard. The hood has the matching body number from the build sheet and they thought it was in lovely condition. It has a dent on the passenger side which he thought could maybe be sucked out (does anyone have experience with that?)
He sent photo of one panel gap around the hood being slightly wide, but the other side was better and the overall looked okay,
He felt the year old paint was in many ways the disapointment in that while it looks okay at 40ft, they'd only masked off and not even painted inside the door jambs - also of course no fender notches. There was also scratching on the front bumper which he thought came from someone sanding the paint who'd managed to sand the bumper top too (I'm not sure if this could be buffed out or would need rechroming..) The color isn't correct either as it has too much flake in the mettalic compared to MB Bronze Brown. (Does anyone have experience of sanding down paint, before taking off the chrome and doing a decent respray including the door jambs as opposed to a full bare metal respray?)
The trunk rust was surface and he said that even in a full restoration you'd keep this solid trunk floor with original spotwelds not replace it - just needs cleaning up and protecting. They also didn't have a problem with the footwells which seemed solid though covered in loads of underseal. There was evidence of moisture in the footwell which was likely from the air inlet above. He thought there is a perished rubber piece in there / blocked drainage holes that need to be replaced. He also said the seals around the soft top well need replacement with a huge gap that would just let in water seen in a picture.
Underneath it is leaking oil though he said they all tend to - he thought it would benefit from the oil pan gasket being changed.
Also he mentioned changing the plastic parts as the gear shifter as they were sloppy feeling which is done through the access panel in the transmission tunnel.