To answer your question, yes its easy to make a divider but you have one chance and having it cut the right size by the Lowes employee. Use DURAPLEX plexyglass. It has a bit more flexibility and wont crack with a little pressure like the cheap stuff does.
I have the same tank your talking about. With the 4' screened lid there is a lot of flex in the screen so if the snake pushes on the screen (and he will i guarantee ) he will be able to lift/flex/stretch the screen about 1" and thats enough for him to get caught trying to get over the divider so make sure you have a Tank Brace (otherwise make a brace) 1/2 way across the top of your tank so the divider is Siliconed on all 4 side to the tank. The Floor, 2 sides and on a Top Brace.
With all this said, If i were you I would make a beautiful 4' tank for that Coral Glo and let him live alone like a Rock Star!!! He could have the coolest pad, 2 nice hides, a big water dish and some nice climbing things as Balls Love to climb given the opportunity. They will climb for hours at night if they have a home made PVC type jungle gym like a lot of us make. Plus PVC is easy to clean. I spray painted mine like a branch ect..
Ther reason I suggest giving him the whole tank is because I find they really will use it at night after they get use to the tank change. Some people say they only need 24 to 36".. Well im sure they will live like that, but give them 4' with things to do and they become little investigators at night and I think its acually healthy for them to climb and do things...
Here is something to give you a idea of what you can build very easy if you decide to give him a big cool pad of his own. This one is 46" long by 22" Deep but you can make them 12"Deep for a smaller tank. This costs $12 without Paint & I took the leaves off fake Reptile plants i already had.
Heres Sully at about 100 grams. Just hanging around
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