A REALLY big female retic can get over 20 feet, easily. I would recommend an enclosure 12 x 6 x 6 for something that large, AT LEAST.

Our local reptile zoo had a female retic 23 feet and about 300lbs. She was in an enclosure that size (although a little taller) and she seemed okay in it. I helped move her around a few times and man it was not easy even with 3 or 4 of us at a time. A lovely, docile and intelligent animal she was.

And drama, I only asked because I've seen people say "I've been studying these since I was a kid" before, and it turned out they were like 13 or so.

Good luck with your annie, if you have any questions I'm here.

Chris