Put the metal on the end of the reading nook. Doesn't the copper look great?! I found if I wore my hat on my face, it helped keep metal chips out of my mouth, and seal around my nose to keep the chips from slipping into my goggles.
A buddy came by and helped. He knew a thing or two about good, neat, wiring. We also finished the plumbing to the point where we can now SPRAY FOAM. (Finally!)
Tee will face toward the hole in the wall. The fitting sitting in the lower left will be screwed in from the outside, sandwiching the metal. The hole is black because the temporary tape stayed on in the rain :)
Well, it's raining today, but here are pictures from earlier in the week: marking out a hole for a vent pipe, and then once it was cut, the sunset through it.