Well I have the AKI ok, and I couldn't wait to give it a try...
It is a piece of cake to wire up the Happ analog stick to the AKI. Assuming the wire colours are standard (they should be), here's how to do it:
[at the molex connector]
Wire the 2x Red wires to +5v
Wire the 2x Black wires to GND
Wire the Purple wire to J1X (or J2X)
Wire the Blue wire to J1Y (or J2Y)
I haven't wired the buttons yet as I have only done it temporarily. Presumably Black = GND, Red = One button, White = Other button.
Also make sure you wire to GND the 3 axis you are not using (unless you are using them for other controls of course).
The pots are actually wired to the AKI via the 'POT AMP' board on the stick. I haven't messed with it but there are 4 small pots on the board which can be adjusted, I am guessing for the min+max resistance of the main pots (?).
Plugged the AKI in which was straight away recognised by XP, and it appears in the game controller list. I calibrated the stick and tried a couple of games and it seems to work great. The cursor in the test screen doesn't jump or twitch at all, unlike gameport devices often do. I'd highly recommend the AKI so far

Not a great pic, but it proves I did it at least
