Sounds okay, except I wouldn't put in the warmest location- we mostly all do some variations of the above- do what works & whatever you're comfortable with.
The warmest location might be too warm with no escape from the pillowcase- I assume the idea is that the snake will be more mobile if warm enough, & obviously you don't want them cold, either, but just bear in mind that heat tends to "help" the dried-on shed to stay put. I'd suggest midway as far as ambient temps.