Hey Geordie I'll start it out on a positive note - check these guys out their workshop is near Gianyar:
Blueberry Guitars :: About Us
So there is craftsmanship and guitar expertise on Bali.
Your problem will be getting the visas/permission to do the business, for that info I recommend you look back in the stacks here for startup info - get yourself a case of beer/pack of smokes/ounce of weed (whatever your poison is) and read all about it.