I agree Zig.
I'm at the max with Wallace. His water area is unfortunately not a swimming area and I just can't provide one. He's fairly topped off and likely between 8.5 to 10 feet. He uses his cage, every bit of it and does cruise through the water now and then.
They are very active when they are lean.
I like seeing videos like this. I often check for boa constrictor videos in the wild and find a lot of them show the boas in trees.
I'm really looking forward to reading Nick Mutton's new book. I'm sure the arboreal habits of carpets and scrubs will be mentioned in it.