Like mentioned, Dumerils get to 5-8' on average. They are a thick body snake with good girth. My little girl is about 1.5 years old and just over 3'. She is pretty laid back but does love food.
As for fitting in the cage, no idea what size cage that is. Looking at it, it seems kind of narrow. Heavier bodied snakes need wider cages. And no idea on the heating etc. You need to give more info about the enclosure before anyone can really answer it.
For example, i have my 3' girl in a 4x2x15" cage with shelf and she uses all of the cage usually during night. And yes, she even climbs all over her shelf.
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