I have always wanted to build a room sized enclosure for a large constrictor like that.
I am a firm believer that giving a large snake like that room to move around encourages growth.
I would LOVE to own a 20' plus Burm. I know that it would probably take a few tries to get an animal that had the genetic potential to reach that size and a boatload of food, but wtf...isn't that part of the fun LOL.