I have a 100 gallon for my beardie (i’m not using it yet) and it has no screen. It is 4’x2’x20” and has a 2 inch thick bar in the center of the cage. So i’m going to need two 22”x24” screens but I do not know what I should use to make them. This is the tank
There is a lip around the top rim, measure that and use 3/8 plywood to fill up he complete area. Now cut out your ventilation slots on each end to let some of the heat escape (cover them with some type of window screen).
You can mount your lighting inside the tank easily this way.
Also you can build a 1x6 frame an mount the 3/8 plywood on top of it to raise the lighting up so it's not exposed to your view, plus it allows your decor to be taller, giving your dragon the climbing spots it needs. This is how I did the 55 I had years ago.