[tallon]

Hi guys,
I recently bought a really nice '00 40V A8 4.2L
and I am looking to put it in a mid-engine space frame with a 2.8 a6 FWD Auto transmission.
I've been told it's a bad idea but want to do it anyway because my options are limited and this specific build needs an auto. I can't find any info online related to this swap but I want to know basically how different the wiring and computers are. The ecu's look exactly the same to me, can the a8 ecu be used? Do I need the wiring harness from the a6?
I was hoping someone here might know because there isn't one person on the several American audi forums that does.
I have yet to start tearing the A8 apart.

So basically 5hp24 to 5hp19, any idea?