I only read the first page and skimmed the last. However, I raise the question of obesity. Snakes are so lazy as it is. I'm not saying give a BP a room but if you can provide proper conditions outside of a tub as easily then I believe you shoot. Here's the hypocritical side, I'm using a rack right now until I can afford to build my own cages. They won't be big, but bigger than what the tub is and I am taking into consideration all the needs of the animal.
Short answer is tubs are great and they don't matter to your animal. However, for display and to reduce the chance of obesity get a cage and make it suitable for the animal.
