Brand new BP owner, first shed(I think), and advice on some other topics.

[VereMyth]

Oh ok, my bad. Sorry bout that.

As for covering the sides, etc...

I personally wrap my glass enclosures in 1/2" foam board insulation. I live in MA, so it can get cold and dry here, so that really helps to maintain temps and humidity. You can do as much or as little as you want to make it aesthetically pleasing. I just cut pieces to fit the sides and back. I cut the sides first, then the back. When I cut the back I make it an inch longer than the actual measurement of the back, that way it overlaps the side pieces to make a squared off edge. I tape them nice and neat and drop the piece in place. Then I secure it to the tank. I personally tape it, but glueing it word work too. For the top, I cut it to size first. Then I place the heat lamp on it to trace it and cut the hole a bit bigger than that to allow airflow and so it's not in contact with the lamp itself.
Easy breezy.

If you live in a warmer, more humid climate than I do you can use cardboard, poster board, construction paper, fabric, whichever you like. The goal is to make the snake feel more secure by blocking out light and movement around the enclosure, so as long as that's accomplished there are plenty of options.

I will probably use cardboard then xD I live in florida and our ambient humidity at least where I am(Around the tampa area) is like 60% Lol.