Jack any thing is possible
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Ive been thinking about this for ages and if In keep my golf i will do it, The blog you linked to is Malooshecks I think he's a eastern europe guy but lives in america?? He fitted the VW sound processor but then upgraded that to the Dynaudio.
Its just a matter of getting the wiring diagrams and sorting the wiring out, although be aware the dynaudio speaker are very expensive.
Darren