add midi out to Guitar Hero drums with Arduino kit

Hi all, i seen online somewhere recently a simple midi drum kit which was made from Arduino and a hand ful of piezo, resistor and capacitors.

I would like to add midi out with velocity sensing to my unused GH DRUM KIT.

I would imagine i could simply build this into the drums.

I would prefer the drums to have a USB midi out rather than standard Midi conenction.

Does this sould like it is possible and are there any projects yuo could point me to for advice?

many thanks

I did see the guy from Make doing something with the guitar hero guitar maybe try google and youtube for this.

There is something in the community about such guitars also

Maybe this helps you on your quest :)