While doing work on the 36X PCB - http://forums.xbox-scene.com/index.php?showtopic=742662
I decided to start on a PCB for the Duke controller as well.
It's the same deal as the 36X board, just a blank slate so other things can be wired up to it. The only drawback on this board at the moment is the ABXY, Blk and Wht button's contacts. The original Duke board has Analog buttons, and the contacts are covered with a conductive film, then the rubber piece presses on that to make it touch the contacts on the board and the harder it's pressed, the more of it makes contact, and the lower the Resistance, similar to the PS3 controllers or how a volume knob on a stereo works. This will need to be addressed at some point, most likely with the rubber piece being replaced with a more 'typical' one that has the conductive contact on it instead.
These are the renders of the PCB done in DipTrace.TOPBOTTOM
Here are a couple pics of the prototype made up.