I've never understood the whole too big setup argument. Africa is a massive land area, and they live there naturally.
We are throwing them in a cage that fits in a house. To big?
Make it as huge as you want! They are going to feel safe and secure in the hides you provide
0.1.0 Normal Ball Python
0.1.0 Columbian B.C.I. 2013
1.0.0 EBV Red Group Pastel Hypo Jungle B.C.I. 2013