hi all its been a while but im back

has anyone come across and detailed build threads on an s3 engine into a mk4 4motion
i have done searching etc and it hasnt really bought up much thats worth a read..
i know the engine and box fits straight in to the mk4,
im after the sort of knowledge like how much of a pain in the arse with matching the s3 loom to the mk4 and reprograming the
ecu to match the mk4 clocks immobolizer etc etc.
many thanks
james