So, I did finally manage to find where the Furniture Library Editor was burying the brace in the upper left menu, after sifting through every category, so at least I got that.

Where your object is in the catalog depends on the preference you have set in the Preferences dialog. Set it to "Searchable List".
In the catalog pane (top left) select the category you have set as the category in the Furniture Library Editor. In the Library Editor also set a few key words that identify your objects. They can be used for searching.
In the catalog search box you can type a (partial) name you have set for your object or (partial) tag names. This search is smart and fast! Even without selecting a category you can find objects very fast by typing multiple (partial) names with a space between them. It filters the list on your search criteria.

So, I'd like to...
1. Get the light PANELS to appear on both sides of the brace so it doesn't look like just an empty space from the left side.
2. Have them both light up.
3. Get the light to shine at a much lower intensity, again, like the reference pic from the show.

Either use a floor with the thickness of the brace which will create a light panel where both sides are flush with the brace or use two panels, one for each side.

1. Is there a way to change the type of light that’s emitting? I saw in the Light library that there’s a ‘Fireglow light source’ and it might be nice to try that.

With the panels you have you can set a different color to the panel which changes the light. Another trick is to create semi-transparent panels (non-light) with one of the light sources from the catalog between the panels but I don't think that is the right solution for your panels, you won't get a nice even spread light on the panel.

2. Do you have a coffee account or something I can kick you a couple bucks for all the help you're providing me with? I think I would have given up by now, trying to work through this on my own.

Thank you but there is no need for that, it's all freely offered, just like everything on my Dodecagon.nl site is completely free and open source.