I really like the in-depth research into prices and materials. This is really important if you were planning on submitting this proposal to your school!
I like how you focused a lot on the interior of the locker because that is such a main part of the locker and how everything is divided up into sections. I would not have thought about diving lockers up into sections that are used for certain things as you did. I want to know will there be any exterior designs on the locker? Like, what decoration would be put onto the locker?