A lot of cage builders use PVC. I wish that I had a good supplier for PVC sheets LOL. A ball python cage can be built EASILY from one sheet of PVC. I would suggest using the PVC to build a rack though.
You can find plenty of designs for great racks that hold the CB70 tubs from Iris. In fact, you can buy CB70 tubs with water bowl holders from ARS caging very reasonably.
If you are planning on having another Ball in the near future you will probably end up with more than that in the future. You might as well take the time now to make space for them.
If you don't want to build a rack I would suggest building stackable cages at the very least.