My modification was done on a cheap acoustic guitar, the modifications consisted of converting it to a "Fat Strat" config.
I suggest you DO NOT do it to a pricey acoustic guitar or any acoustic guitar that you REALLY LOVE and just want to keep that acoustic guitar on it's way. If you want to do this, better buy an acoustic guitar that is cheap.
Pros: You get to Electrify your acoustic.
Cons: Sacrifice much of it"s Tone
Step 1: Pick-up routing
Some extra wood
guitar switch(it is up to you what switch you need)
First of all you need to route the areas where you need to place your pick-ups.