I love the ceiling space, but you need a minimum of 3' and preferably 4' of width IMO. Carpets are SEMI arboreal, not fully. My coastal (7+ feet) is on the floor more than my retic ever was. The retic was the most arboreal snake I've ever owned. The carpet does use all of her cage and the perches are very valuable for the species, but don't skimp on the floor space and set a carpet up the same way you would a fully arboreal species like a green tree python or emerald tree boa.
It appears you are rather handy. You could add to the bottom of that cage so there is an area on the bottom that extends out to 4 feet and keep the height.
I would love a 4 foot tall cage for my carpet and boa, so I do like your thought process when it comes to ceiling space.
I'd set a carpet up similar to the way I'd set up a smaller retic or boa constrictor. They are all semi arboreal, carpets being more-so than boas from what I've seen, but the other half of semi arboreal is terrestrial and you have to have that for the carpet group.
Check out the middle cage here. Its 4' wide X 2' x'2. She's perched here, but she uses the floor a lot as well.
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