well...you can buy a premade one that works with one of the consoles you mentioned, then hack the other 2 pads and add them in. This may be a large headache because some of the sticks are smaller and only have so much room in them. And some odd wiring.
Or..if you are wood working inclined, draw up some plans of your own, or see if someone will share theres with you, see what kind of style stick you'd prefer....build it. Hack the controllers and wire it all up yourself. Its not really hard. Just depends on how deep you wanna get into the woodworking because some of the tools required can be expensive at first.
Also, hacking controller pads isn't for everyone. I'm not soldering inclined since my hands shake...so I've gotta get a buddy to wire mine up. But HarumaN on this forum hacks them for a pretty good price. I'm sure he'd hook you up.
3rd option is get someone to custom build you a stick. Though easiest on you, it can get expensive depending on who you get to do them and what all functionality you want/need.
Let me know if I can help anymore.