I have created something like this:
The most important things:
- arches on the pinky, ring and middle fingers
- pointing finger button
- additional buttons closer to the palm (i.e. of the right-hand controller, buttons should be on the right side of the touchpad/joystick, not left)
Of course in the place where I have placed the joystick, there could also be the touchpad (with the joystick extender). In general, I don't see the sense of placing touchpad/joystick, but as we have enough space, maybe some developers will make a usage of it.
The mounting of course could be like in your already existing project - i just couldn't have made that with plasticine.