Your tank would need to be pretty good size, especially if you want it to remain with a pool as an adult. Just looking forward on this.... A soak for a full grown BP would not be small. Lookin at a pretty huge tank to balance all that with 2 appropriately sized hides and stuff.

Also it would be removable? For cleaning yes? And separate drinking water or no? Cause when they soak sometimes they do their business in there, which would make water unsafe for consumption. You would have to clean it ALOT if snake used it.

No negativity, mind you. Just brainstorming