Not bad at all to be working on details that fine after 4 months of doing it on the side!

You said BOV, but I thought you were running the RS6 ECU? You are planning on coding out the DV, i guess?

A thought I just had (but it could be a bad one, it's barely formed), as I know you mentioned you were dreading the wiring harness integration, have you considered a standalone like VEMS (I know that one is the primary one used on the C4 cars)? Also, you could probably call Marc at EFI Express. He is crazy good on the C4 chassis ECU / Tuning side (He wrote me the chip for my RS2 injectors in my C4 S6), and might be able to assist. He does a lot of custom VEMS installations. I imagine the wiring / ecu part will involve equal assistance from the BCY & C4 communities, have you considered a dual thread on like motorgeek.com or theprojectpad.com?