I don't agree with your choice of enclosure, and based on this thread it sounds like you've chosen to ignore a lot of advice. Also based on the previous thread, I don't think you're changing your mind. For the sake of your animals doing best with what they've got:
1. I do not believe misters are advisable or necessary for a ball python. There are a number of other ways you can go about raising the humidity, so I'd see what the humidity is at with the final enclosure before you pick a way to raise it. My humidity literally stays at 35-40% in my room and my snakes have perfect sheds. I rotate in humid hides when I see their belly go pink and remove it after they shed. There are lots of threads here about them.
2. If you place a 2 foot segment of tape in the middle of 48 inches, there is only a foot of unheated space in each tank. That's not good. What is the ambient temp. of the room or tank and how do you maintain that? The flexwatt is NOT good at raising ambient temps and the snakes only really sit directly on the tape when they're digesting.
3. I'm sure someone will post about the thermostats, but I use a Vivarium Electronics VE-200. I believe this is more than reliable enough. I also use a $25 dollar HydroFarm thermostat set 5 degrees higher than my VE-200 as a failsafe. The stat fails and the hot spot goes unregulated-> hits 5 degrees higher and the other stat kicks in until I notice the problem.
4. The corners of the tank need to be raised to allow airflow under the tank and so the cord to the flexwatt doesn't get pinched. If properly regulated, the flexwatt won't get much hotter than your hand, so the odds of it spontaneously igniting the stand are low. That said, for safety, I'm sure there is a product you can use to make it safer. Styrofoam sounds like a bad idea.
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