Looks good. Is that a feed bin inside the tub? curious how you set that up.
As for a watering system, I just use the parts from reptile basics. The cheaper nipple and the tubing and T's and elbows. and the tank bulkhead valve. I just get a Rubbermaid container locally for the tank. Just double check that after you get it setup and running that there are no leaks. Had one valve come in with a piece of machining debris in it that caused it to leak a few hours after I started using it. Took it apart and cleaned it out and haven't had further issues. I also use filtered water in mine to avoid having problems due to mineral buildup from the water. also, our tap water sux.