Interesting, the only one I knew of was texaspro’s Custom SkyRay King SRK Driver.
There might be a much easier option for squeezing more chips when designing the board. The amc7135’s can be pretty much stacked end to end because the back tab is the same as the center front tab. Every one laid in a row where each leg is in parallel with the next. Its not my idea, I just came across the picture not to long ago. The board could be made much smaller or more amc7135’s added on the same real estate. I thought it was pretty cleaver. Click on the picture at the very bottom of this page.
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http://www.swiatelka.pl/printview.php?t=10422&start=0&sid=1c6db3c77f1302ad15173585ada51f0d