Thanks for all the answers guys ! Really helpful.

I found a pretty large plastic tub in my garage. I don't know how many gt it is, so I measured it. It is 83 centimeters long, 18 centimeters high and 46 centimeters deep. As you can see, I'm not from the states so I use centimeters. I don't know if it is too big for a 6 months - 1 year old ball python. I will of course add several hides, waterbowl and some plants. What do you think?

I also thought about the ventilation. Where and how many holes in the tub should there be? My room is quite warm because of the snake cages.
I really appreciate all answers, it really helps.