I know this isn't a coop construction question but since it still has to do with chickens and will probably involve power tools I'm hoping those of you with building knowledge can help me out!
I asked over in the incubation section but haven't gotten a response.
I'm making an incubator out of an old mini fridge and I've taken a look at the other threads here but I can't seem to find directions on how to cut out a viewing window. Does anyone have any ideas for the best way to cut 12" x 12" square out of the door of the fridge so I can keep an eye on the eggs and watch them hatch?

I asked over in the incubation section but haven't gotten a response.
I'm making an incubator out of an old mini fridge and I've taken a look at the other threads here but I can't seem to find directions on how to cut out a viewing window. Does anyone have any ideas for the best way to cut 12" x 12" square out of the door of the fridge so I can keep an eye on the eggs and watch them hatch?