Since our hallway is a bit small, I've come up with the idea of solving shoe/mitten storage by building a shelf in the laundry room where only the opening sticks out through the wall into the hallway. In the upper compartments, I plan to have baskets with mittens and various small items, and the lower compartments are intended for shoes. The questions now are:
Which material should I use to build it?
Should I attach pieces of rubber matting or similar in the shoe shelves to better handle gravel/moisture?
How should I finish the backside that is in the laundry room? Build it in with plasterboard so that from the laundry room it doesn't look like a shelf?
(the lower drawing shows hallway+laundry room from above)