hey about the 10 foot in a year, thats crazy. i have a pair of retics which are get bigger, and are more aggressive than burms, in my opinion. the male i have had since he was about 2 1/2 weeks old that was 7 months ago. he is now 6 feeet long. i do not skimp on the feedings at all. about the enclosure size, if you can build now what a 12 foot snake will need. you put 8x4 what is that 8 foot long and 4 feet deep? if so how tall? burms as well as retics like to climb sometimes. my enclosure is 8 feet tall 7 feet long and 4 feet deep for my 12 foot male retic moose. he climbs just about every night to about 6 feet from the ground. you can go to the thread "moose" and see pics of the enclosure. good luck on the 10' thing hope ya do and keep a healthy snake in the process. don't forget pics.