Dave C. has released all necessary information for his GP2x N-Gage QD D-Pad modification.

Here is what he wrote:

Here are all of the CAD files for the N-gage QD D-pad mod that I did. It includes all gerber and exellon files for PCB manufacture as well as 3D CAD models for the pad mod itself. Do what you want with these. Mod them for your own use, reproduce and sell them and make a fortune, they are now public domain 🙂

I realize that not everyone can use these but if you can have fun.