Ours is not that large, but we have room for 3 hooks and drawers for gloves, hats etc. and shoes underneath. I did measurements a while back for someone else so here’s what I have...

Just remember that regardless of size and configuration, children will try to avoid putting ANYTHING in its proper place and it will all end up on the floor in a pile anyway. Getting a mudroom to truly work, requires a great deal of adult supervision at the moment of entry into the house.

My friend had a mudroom storage bench built and for four kids, it is 72" wide (so each kid has 18" dedicated to them. It has 18" drawers under each section for each kid to store their shoes in. Her actual bench part is about 2 ft wide but with the locker on top that takes up 16" there's about 8" of sitting room. On top, she has cubbies going across with baskets for storage.

I'm designing our mudroom now but we live on a working cattle farm so ours is a true mudroom :) I'm using IKEA cabinets, though, and will have drawers for kids shoes. There will also be a dedicated open area for the family's tall Muck boots. Overhead storage cabinets will contain baskets for gloves and other randomness.

Build a prototype, use it and see what you would change. It doesn't have to be fancy, particle board or possibly even cardboard may work.

Let the wall size decide the dimensions. Give each kid their own divided space. Have behind door space for out of season gear to keep things more organized if possible. This houzz photo shows one way. You could also put hooks on the side walls for more hanging.