Update! Finally! lol
Today I didn't get much done... time is a real limiting factor lol
I decided to work on the vents today. Originally the idea was to have 3 in each one and leave the back open. I reevaluated that decision as the edges on the insides of the vents that would be on the interior of the cage were kinda sharp. So I went out and brought 6 more.
The Vents will sit back to back through the ventilation holes. Unfortunately, thickness of my walls is only 1.25" and 2 vents back to back are 2".
Out came the grinder to take at least 3/8" off of the backside of each vent.
It took 3 vents before I figured out the best way to hold them while cutting them, but I finally figured this 2 clamp system and I had the remaining 9 done in the same time it took me to do one.
Halfway there.
All cut to size.
I decided to seal the interiors while I played with the vents.
Using silicone I placed the vents in the holes.