Personally I would do a 72x30x18 for that boa. Like bcr said, anything 30" deep, you want 18" height to make it easier to reach back there.
Now if you can afford bigger, by all means go for it. You can never have too big. But as boas get older, they seem to become more happy with smaller places if that makes sense. Like Rosey and Vicky pretty much only use their shelves or even really move around when its getting close to dinner time. Otherwise, if they are content, they usually just bounce from flexwatt to cool side and back or they stretch out partially at the front door.
I do leave the doors open on my cages a lot though when i'm watching TV so they have the opportunity to hang out which they usually do with just their head on the litter dam.
Here is a pic of my set up. I got my almost 7' girl in the bottom T10, my 5' sunglow girl in the middle T10 and my 5' retic in the top T10. In the T8s are my BP on the bottom, salmon boy in the middle, and the top will be for my suri. Then I will be adding another T8 on the top for my dumerils. I will be changing the caging up as needed but for right now, all of them seem content and extremely docile, even the retic lol. And you can see even my big girl on the bottom who is probably close to 7', she fits inside that hide of hers comfortably lol as well the 5' sunglow and 5' retic.
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