The analog mod was quite simple because all the points are exposed on the back of the potentiometer and wiring it up to the analog ain't that hard:
As for the pad I'm going to use an original Dual Shock (not worried about the vibration yet, think of a way to implement that later) as they were fully digital with no extra circuitry making a point to point using copper enamel wire inside the PSP less complicated:
As you can see the arrangement looks very similar, hopefully the process should be quite simple.
Seeing as the Dual Shock uses a common earth on the face buttons and dpad does that mean I only need to send one earth wire to the PSP from the pad? Also, does anyone know if the PSP operates in a similar way?
If the common earth things works in groups then the maximum wires I will require is 22 - A small, sexy looking device to enable connection and disconnection of the pad is required to mod into the PSPs casing somewhere - Once again, any ideas?