That looks really good! Next item on my list is a head unit ...
As to the wrap - it would have to be either almost identical to the aluminium trim, or similar to some other parts of the interior (in my opinion, of course) - so perhaps a gloss black, like your gearshift?
Human eye always looks for repeated / supported colours and textures, to perceive a harmony, so unless the part in question is intentionally the centre of attention and plays on being a one-off, it works better when there's something to support it, visually.
PS Which Pioneer unit you went for, by the way?
It's the Pioneer SPH-DA120
Great unit, if you have an Apple iPhone it's amazing! Not sure if your familiar with carplay, basically you put your iPhone in glovebox / location of your choice where you have wired the lightning cable to and your phone screens is practically mirrored onto the radio for all apps supported by carplay (more and more being added) Spotify, Amazon music etc, as well as Maps, Phone, Text etc all controlled by Siri.. also has a brilliant 13 Band EQ and 4V Pre-amp out which is a must if you are adding an amp in future
Have a look if they make a 'pro-fitting kit' for your car, that way you don't need the little rectangle blanking plate between the fascia and the radio. It looks a lot neater. Weirdly they don't make one for the CLK so i have spoke to a custom fabrication shop about making one. See picture below for one in a SLK, looms perfect
Also COMAND UK are perfect for fitting, after going to multiple radio shops around Northampton trust me none of them knew what they were doing. In particular a place called 'Megans' who scratched the dash (if you look closely you can see some marks on the black fascia and on the climate control)
It was eventually fitted perfectly by COMAND UK for £50 which I thought was very reasonable and not too bad of a drive down.
As for the wrap I am thinking of approaching a custom vinyl printer, the type companies use to print vinyl for vans etc. I've been on
Custom Sticker Printing & Printed Labels Buy Online UK Company and they want £9 for a 30cmx30cm block of vinyl with anything you want printed on it
Now all I need to do is to find a high res image of the MB design and then I can give it a shot, if not wrap in Gloss black as you mentioned

do you think anyone on here could help me locate the image of the MB design?
If you have any questions on the install of the aftermarket radio from the required cables to retain steering controls, aerial adaptors etc feel free to PM anytime as I'm a bit of an expert on this now after spending months researching for mine
P.S having Ben round this Tuesday for the alloys :bannana:
Cheers
Abs
Ooh also, this Pioneer is one of a few which has the nicer style touch screen like an iPhone almost glass feeling, rather than those cheapish screens