That is looking great! I was thinking of doing something like that a few years ago, with a drainable tub, for my yellow Annie...
Your pictures gave me some great ideas on how to design a cage, if I ever get another yellow anaconda...
My yellow was in a monster old scool aquarium, a 400 gallon, the glass was so thick it was green and wavy looking from an angle...I used a faucet powered aquarium siphon to drain and clean it...a weekly nightmare, LOL. I always wanted to put a drain on it, but couldn't figure out how to drill a hole in 1/2" thick glass

, I couldn't have even flipped it on it's side without four or five guys to help, LOL...
your retic is going to be living the life, for sure...
It's sad how many people I see that put retics (and even anacondas

) in terrestrial cages with itty bitty water dishes, seemingly oblivious to the fact these snakes spend a large portion of their life in slow moving rivers and lakes...