I got to work over the past week on the interior.
Ended up giving the M3 rear seat assembly, M3 door cards, rear centre console and centre console armrest a good clean. This may be some OCD level E9x autism, but the M3 rear seats, centre armrest and door cards all have Novillo leather, which is a bit finer and supple than the Dakota leather found in the factory non-M's. I mainly grabbed them as the Novillo is a closer match for grain with the Merino leather that's found on my front seats.
Restored all the leather bits with Leatherique Rejuvenator and Prestine Clean (this stuff is amazing) and fitted everything up. Here's some quick pics that I snapped the other night.
The rear centre console and cupholders are looking a little average. I may remove the soft touch coating from them, which is something I previously did to all the plastic pieces found on the front half of the interior.
Car is meant to head out to an amateur track event in the next few weeks which should be some good fun. Never pushed the car that hard as I've never taken it to a track, so will be interesting to see how the car and I both behave in that setting.