Okay, (almost) final update. So after letting that collar sit with the kegs weighing it down for a little over 24 hours I was able to continue working and got the keezer actually running.
Inkbird ITC-308 is just hung on a hook on the back of the collar, so it's not immediately visible, but I can easily grab it to check the temp and/or adjust my settings
CO2 tank is outside the freezer (my last keezer I had it inside, but I've read that can cause some issues with the accuracy of the regulator), tucked behind the tv stand because according to my girlfriend "it's an eyesore"
Here's the keezer after I installed the taps
And here's the inside after loading the kegs I have on hand in and getting gas on them
And here it is in place, next to my glass shelf
Next thing to figure out is a way to pad the magnets on the back of the drip trays so they don't scratch the paint on the front of the freezer (I noticed that was a problem on the last keezer, and it was much more noticeable since I painted it black over the original white paint), and I have to get the fan mounted, but me being in a rush during this project didn't realize the fan I have is too big to mount right to the 2x4 collar, and I probably should have went with 2x6 for this project. But oh well, what are you going to do?
Now that the brunt of the project is done, time to sit back and enjoy some home brew for the first time in quite a long time (too long really). This is a dry Irish stout I had brewed back in February, in preparation for a St Patrick's day party that was inevitably cancelled due to Covid, but tastes just as good now