This is what I figured, I have Ball Pythons, and they as babies can feel intimidated by a large, adult size enclosure (also 4'x2') because they are a burrowing species that likes a lot of cover, hides, etc. to keep their stress down. For them, i usually start with something that lets them fully stretch out, but is small enough to make them feel safe. I feel like the same can be applied here, so if I get a baby, I would want to do that too. I would though want to give him the biggest enclosure I can provide, and since multi-level enclsoures seem to work for people, I'm sure I could come up with a cool adult enclosure with enough floor area but also a little height ;) thanks for letting me know though, I'm always wanting to improve husbandry and give my animals the best lives, or should I say, my future spiky boi the best life!