Re: customizing...
JS30's don't have pickguards...
and they're fixed bridges, if the bridge gives you trouble kill it (and get a better one). Umm, when I tried them those pickups were very bass-light, kind of like anemic EMG-HZs, so I'd suggest replacing those as soon as possible. Also, while my old jackson had decent electronics (volume, switch, tone) I suggest you get new ones. The JS30 series plays nicely but the equipment sucks.
1. Pickups
2. Electronics
3. Straplocks
really optional:
4. Bridge (only if you don't like it, I haven't seen one in a while so I don't know how good or bad it is)
5. Nut
6. Tuners