Enclosure size for large colubrids?

[Sasha2]

I think it would be tight but thats me, especially when they get 8 or even 9ft. I had a pair of taiwan beautys and they are fairly active.But super cool.They were super tiny when I got them and kept in shoebox size tubs when they were babies(they mostly just hide until they get some size).
I think with some of the large active colubrids its up to what you can afford to give them, especially the more arboreal species.
Keep looking at how others keep their adults and get ideas of what you think they need and you can give them.