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[millertime359]

A jig for this? Really?

To me, this is more suited for a router since you're boring out metal. It's tough to make room for a jig. I think a jig is more suited for making edge cuts where you have more room to work. These windows are only a few inches in height/width.

The RZ worked really well as long as I wasn't cutting along a knot in the plywood.

Yep, You drill 4 holes, one in each corner big enough to insert the blade.

Then connect the dots.

It gives you nice rounded corners and straight edges.