This is my current project. This was a blank wall between The entryway and garage. I opened up the drywall on both sides exposing the 2x6 framing. I then built the main locker boxes using 1/8 hardboard for the sides and 3/4 plywood for back and sides. These then slid between the studs and sit atop 2x4 platforms I built between each stud. There is a framed and insulated 2x4 wall surrounding all sides on the garage side which are then dry walled with 5/8 fire rated drywall. I then framed/ trimmed out the hallway side with poplar and built the lower cabinet. I have a top ready to cut and stain for the bench. Then I need to make doors for the lockers and paint the works.
Out of curiosity, how deep is the area where the coat hang?
BTW.......Nice Job!