After making/modding a couple sticks there a certain things which I wish there were just easier ways to do. For example, some one wanted me to mod an 8-way IL stick into a four way one. I did it, but it took a while for something that is pretty simple.
Something has come to ay attention that could make stick modding way easier for a good chunk of change. The makerbot: MakerBot Industries - Robots That Make Things.
Now what it does is pretty simple. It takes 3D model files and makes them out of extruded plastic. I can think of few things this can do for the arcade stick hobbyist.
You can make custom button and joystick parts to mod with. I can see That you could make your own restrictor gate for the brand of your choosing. Even button parts.
The catch is that it is about $1299 to start, but take a look and discuss.
I have a feeling these things will start to show up a lot more in the future.