Easy to fit. Strip down of rear end but I have rods for fishing wires through trim so wasn’t too bad as didn’t need to fully strip out and still followed OEM wiring. If you PM me I can send you instructions on connections and coding with VCDSnice pal was it easy to do and do you possibly have a list of the bits you collected to do it, mines an early facelift 2015 with mib2 system fitted.
Best thing to do is give @DJAlix a PM and he’ll help you out. I think it will be exactly the same for an A7. As for price, I’ll PM you what my kit cost but it may differ for other kits. Always best to speak to AlexHi, how much was the camera?
Do you reckon would be similar for a7