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.
Step 2: Adding New Braces
Since the original braces were taken away, I had to device a way to keep the strength of the guitar's body.
I used excess wood from the guitars that I have built (I always keep all extra wood when I build a guitar).
Step 3: Create a Pick Guard
Not really that necessary, but it depends on what guitar you modify, since I needed something to hold the other two single-coils, I had to build one.
Step 4: Install Electronics
Install all electronics, the electronic config that I used is simple, 5 way with 1 volume.
Step 5: Finish and Test
After finishing it I added some other modifications just to make it look "cooler".