The chassis is aluminum, but the front and rear subframes are steel. Also pre FL uprights are also steel on the A8, alloy post facelift. Not sure about the S8 uprights.Sweet build, I'll be watching.
I thought D2's were all aluminum? would all subframes be rust free in this case?
Also - why did you choose the euro xenons instead of a Mini H1 8.0 retrofit in the stock lights? These euro xenons were interesting in that they seem to be an proper HID without a projector housing. IIRC they also have a motor to change the bulb angle for high beam mode?