<< I know this will make some people crazy but I did not use an original Mercedes material on the interior. >>
Ed -- Doesn't bother me a bit. Personally, I agree with your decision. It would be a simple matter to return to original materials should you wish to do so.
Tom -- You'd earlier asked what leather I'm going with. My interior guy this time selected a Fine Scottish Leather from Douglass. Grain is similar to the original, but the product is of a higher quality. He ordered 6(!) hides for the job this time ... 6 is a LOT. But he's going to be very selective, and there will doublessly be oodles of remants. (any carpet edges, floor mats will be trimmed in this leather ... original steering wheel wrapped with it, hopefully the sun visors, etc., etc.) Also, there will be extra for some experimenting that'll be required for the new seat heaters, seat fans, and massagers. I suspect he'll use some in the trunk too.
As discussed earlier, it would not be a big deal to put everything back to original design and materials if and when desired.
Tom in Boise (although now on Orcas Island in the San Juans)
'71 280SL 4-spd, signal-red, lt. tan leather, enhanced.