Rather than start a new topic… while I wait for the UPS delivery van today, I am doing this:
Started inside with stud finder and then drilled one centering hole out to the exterior.
Got a bigger hole through the brick with a lot of drilled holes around the perimeter and then chiseled out the precise shape.
(Yeah, not so precise; but it’ll do just fine.)
Now to enlarge the hole through to the studio.