I purchased a plastic mirror from Amazon for $17.99 that measures 6 x9 inches.
I purchased a 11 1/2 x 7 1/2 Aluminum Case from Harbor Freight for $14.99, tools not included. They do have a version of this case that has little organized sections. My harbor freight didn’t have that version, so I bought this one and made my own..
I purchased #6 x 1/2 inch phillip screws from Home Depot to mount the mirror to the aluminum case.
I grabbed a small piece of plywood from my scrap pile to make the cabinet shelves.
And used some of my beloved carpet tile scraps. A box from Walmart is about $11.98 for a box of 12 Tiles.