Not in Atlanta but I can give you some tips:
1) Usually 2 holes line up and you need to file out the third hole. Dremel makes quick work of it, but a small round file does the same thing only slower. A drill bit in a drill also works, just put it in the hole, pull the trigger and move it up and down and in the direction you want.
2) Zebra and myself both left the plastics on the truck for concerns of water getting inside the box. Air still gets where it needs to go, but when your driving in the rain/snow, it won't be forcing water in there too.
3) In my kit they sent me I was missing 1 bolt and 1 was too short. In Zedbra's kit, he had an extra bolt. Quality control needs some work there. I have a stock pile of new bolts so it wasn't a problem. Just go to the hardware store and pick up a 6mm bolt (10mm head). Doesn't need to be grade 8 or anything.
4) Relocating the horns. Search for Zedbra's thread. When we put his in, he ro-routed the horns to the center bumper support in front of the rad. You need to splice in 18" or so of new wire and take the grille off, but it's the cleanest install I've seen. May make the horn easier to hear too.
5) I really recommend drilling a drain hole in the airbox before you install the intake. I didn't when I put mine in. When I checked it a few days later, I found a small puddle of water sitting at the bottom of the box. I drilled a 5/16" or so hole in the very bottom of the box and now it drains. We did the same in Zeds.