For buying parts- http://www.lizardlick.com/
As for the artwork, I'd suggest getting it printed at a kinkos office. you basically get it printed as a giant sticker which you stick onto your stick (heh, See what I did there :3). and as for button graphics buy some transparent seimetsu buttons.
http://www.lizardlick.com/Seimitsu-30mm-KN-Screw-In-Buttons_c_188.html
something like these.
as for the modding of that stick, Try looking around srk perhaps You can usually find shiz there
Edit- Dem srk tuts
http://shoryuken.com/f177/paewang-revolution-mayflash-modding-tutorial-ver-laugh-%5Blots-pictures%5D-222925/
http://shoryuken.com/f177/datel-arcade-pro-paewang-revolution-mod-cannon-big-pics-231428/
Alright, I hope this is sufficient