Here's what I've been looking for, now to find the hardware to make it work:
http://lillith.sk.tsukuba.ac.jp/~kas.../cfide-sch.pdf
My intention is not to use a USB adapter; why spend $xxx on to convert ATA to USB to ATA. Plus there will certainly be speed advantages to a direct connection and battery preservation on the Axe (using external batteries for the drive). Somebody has to have tried this before???