Sorry ahead of time for the low quality images. Also, I figure everyone is already past this step at this point in the game... but I'd post it anyway.
Originally, I was going to use the ARCTIC Accelero Mono Plus VGA Coolers and grab some PCI brackets, but that setup was considerably more expensive and proved to show lower hashing results as posted by others.
Then, I was going to do the double Antec Shelf idea like MrTeal. I ordered 8 coolers for 4 boards, but I tried it with a single one and I am fine with the results... so now I am going to buy 4x more boards to use up my 4 extra Shelfs.
So to mount the single shelf to the Chili, I mounted it directly to the board with the provided 1156 back plates. I mounted the top mount to the heatsink as it was directed in the instructions (to the underside of the heatsink). I then used misc computer screws which threaded into the back plates... I have a ton of screws laying around from buying internal computer devices (CDROM, floppy, etc drives) and they provided a very tight connection. The board doesn't look like it's bowing at all. I used nothing besides a rice sized amount of the Antec included thermal grease on each chip (maybe too much but it seemed to work). I didn't really think about standoffs, since I have them mostly sitting in their sides like the first picture showing the back plates. If you wanted to sit them upright, they sit on the back plates. It's probably not 100% safe (something could short the power solder points underneath), but oh well. It works for me.
I tried one Chili with a thermal pad, but that one got 27 Ghs. I redid it the way I did the others and it raised up the Ghs to around 34 or so.
All in all, I'm getting between 34 and 36 ghs.
Followed your guide and fitted this cooler, took 10 minutes and very easy to do.
Used the bundled arctic cooling TIM and getting 33.07 gh/s
Thanks
Edit:
added a small fan blowing directly on the Mosfet's and now getting 36.71 gh/s
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