I think you are right about the size. The 36"x18"x18" seems to be better. I just like the side opening better than the top. But artificial foliage clutter is ok? I am thinking that I want to make the habitat as visually appealing as I can since the python will hide and such. My current thought is 2 identical hides placed on opposites sides surrounded with fake foliage towards the rear and a nice twisted up branch (artificial) of some kind between. I thought the foliage at the back and a 6" or so strip of clear area would give some incentive to move around a bit more.

While I am thinking about it...other than aspen what substrates are acceptable? I am considering a 2" layer of cocofibre to simulate natural ground for the snake. Is burrowing a problem with BP? I thought that this would make cleaning a touch easier as it wont hide feces and whatnot like wood shavings will.