Great write up, this is the guide I used to figure out how to put my HID's in a few months ago.
Only thing different is, I placed my ballast on a bar that has a hole in it (which seems like it was perfectly made for mounting a ballast to) seen in this picture. This spot is exactly the same on both sides of the car and my kit came with a mounting bracket that allowed me to screw it to this hole.
Mine also upon turning on, draws 7.5A for the first 3 seconds, then at only 3A while running. I know this is what the modexpress company just says, and I have not tested this to prove it, but this is why my kit does not need an upgraded harness as well (but I suppose this could all be a lie).