I only have experience with my three boas...that's my disclaimer!
My boas are curious and interactive when they want to be. For this reason, they are in my living room. They look out of their glass doors and 2 of them lounge off of the cage floor a lot!! They appreciate height!!
My boas are also strong- even though they are still young. It always surprises me how strong they are. They also have a strike distance and speed that is simply amazing. When they strike their prey, they coil three and four times around it!! I'm sharing this because I don't know that a tub with such minimal height would be good.....but since it is very temporary....
Well, good luck. I'll be interested in knowing how you decide to go and, of course, I can't wait to see pictures of your new little guy!!