The plan is to make these look completely built in! There just needs to be storage for shoes and coats!
I needed to make a base, this will allow me to use taller baseboards to make the cabinets look more built in. I got two cabinets that will be side by side, so I measured those for the measurement for the base.
I just used 2X4s and screws to hold the base together. You just make a box, with some 2X4s in the middle to hold it together. I secured the base to the studs in the wall.