MDF everywhere
the rear door cards are 1 piece and I think the mk5 rs2000 ones are the same shape but the patterns diff.
I've got a set front and rear for mine when I get around to getting them flocked haven't tried them in the car yet but they look the same.
I think you'll struggle to get a set of cossie ones as I've got the person who bought my seats gagging for the doorcards when I get around to selling them.