This was my plan. Honestly there is a good chance my BP is a male, which tend not to get as big. I'll probably keep him in a divided one his whole life. If he really starts pushing past 4' I'll consider opening it up and getting another tank for whatever snake I have in the other half (which is inevitable). I also do enjoy cluttering up the tanks anyway. If it provides security for the snake, that's great! But honestly I do like the way it looks too haha.
Thanks Aaron for the Heat Tape heads up. I was worried about stacking cage on top of cage with the tape sandwiched between.