I would recommend Focus Cubed Habitats without question. They frequently do custom enclosures. Almost all of my snake enclosures have been built by them, and honestly I am eventually going to sell the remaining ones and replace them with Focus Cubed. They are courteous, communicative, and passionate keepers themselves with reptiles ranging from Boas to Geckos to a Croc Monitor - so they understand varied requirements.
Their website is https://focuscubedhabitats.com. They are also on Facebook and reply within hours at most to messages. The whole business is run by a young husband/wife team who are working 24/7. Ashley, the wife, takes care of most of the communication around orders.
If I sound like a huge fan of these guys, it's because I really am. I've got everything from my Green Tree Python to my Rainbow Boa to my little Sand Boas in their enclosures, and every enclosure has been fantastic.
Note: I have not made a custom enclosure made by them, but I've requested several custom features which they were very enthusiastic about providing. Some of those requests are now standard features offered on their website. I think some of their custom enclosures are in their gallery, though.
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