Absolutely can be done.
It is the same chassis and everything can be transplanted across without much difficulty. It is a big job though.
Guy from Harding Performance has done this for his son; transplanted a 6C GTI's components into a 2-door 6R. I have seen this car since the conversion and its pretty cool (and unique).
Not too sure about the engineers certificate, I can ask next time I see him.
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