hmmm. it works well with the 'black' which isn't at all black. it's a medium grey at best. my 'black' nappa upholstery is the sort of grey which was used in the 80s to make suspect men's slip-on shoes. that said, it does work well together as an interior and starting off with grey for black is a battle against UV fading won.
the 'real grey' is a lot lighter and my instinctive feeling would be that the constract between the alu and the lighter interior colour would not be enough to cause anything apart from a bit of an awkward clash. however, it might be a perfect shade and perfect match.
i was really anal about my colours and trim and spent a good while playing with the online configurator and photoshop before i decided on a finish combination. i also got the black rooflining (as i like black black black as you might have guessed) and becuase i haven't seen an A3 with a light roof lining older than a month or two which doesn't have dark marks on the ceiling.
the trim fits in different places on the sportback to the 3dr. i have a 3dr. are you getting a sportback? the sportback has trim running across the dash which the 3dr doesn't and the door trim is different too. so if you're getting a sportback you'd also have to consider that whatever trim you go for, you're going to have it right in front of you all the time.
it's ******* with rain. if it weren't, i'd go out and take some photos for you. in the meantime:
https://sslrelay.com/s74326199.oneandoneshop.co.uk/sess/utn154517ce0d5a40c/shopdata/index.shopscript
(if this doesn't take you straight to the alu bits, pop 'alu a3' in the search box and you should get there)
there really is no subsitute for seeing it for real though.