Congrats on being thorough on your planning. Big kudos to you!

Add in a digital thermometer to monitor temps too. You want a plastic tub that will just fit two small hides and a water dish. You don't want a ton of open area, since that just stresses them out. The only other thing I can think to suggest is to set up your housing for at least 24 hours before you get the snake. That way you can work the kinks out, and have a nice home for the snake ready for its arrival. Good luck.