I have my boas, carpet, and BRB in 4'x2' x 15-18" tall cages. Between large hides, and a bowl large enough to soak in, it takes up the room fast. Keep in mind that some BPs can get over 4' long also. I have an adult female that is pushing 4.5' at this point.
If it was me, I'd go ahead and go with the 4' long cage to give you room to position things how you want them and add a branch or fake plants if you so desire.
BTW, are you aware that boaphile can have a long lead time and can have poor communication via email? I've heard he does better when you actually call him and talk to him (he is old school). Nothing against the guy, just wanted to let you know the best way to contact him.
All of my cages are either AP or C-serpents.
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