Colours - keep in mind that the PW's are a bit dirty with exhaust soot. Light colour will look pretty silly in a hurry.
Monaco - le Rasscasse
Nimbus Grey Pearl Effect. (Nimbusgrau Pearleffekt) Audii TT colour from about 2000~2001. Du Pont Imron 6000 Clear over base. Or Standox is just as good.
Interior - up to you. I don't sit in the back so..............