Hi Everyone.
Thanks a lot for your comments. The setup is a universal rocks 900 litre pond with a creek & waterfall flowing in to it. I have a UV light to kill all the crap as well as a biological filter. This keeps it pretty clean but about once a year I empty the whole thing out (just a syphon really) and re fill. IN terms of cost, well, a green tree python is cheaper. The universal rocks gear alone is about $5k, then you have the landscaping and aviary surrounds etc. All up the enclosure cost about $10k but well worth it I think. If you are more skilled you could easily replace the pond with a liner and a reall landscaper could do the creek like that as well. I am happy to take some more photos over the weekend and post as a separate thread to give people ideas.