All of my osb cabinet boxes are made from 7/16 osb and are 2 feet by 2 feet. The upper cabinets are bookshelf depth, 11.75 inches. The lower cabinets are 18 inches deep. The doors are shaker panel doors made with spline joints. They are hinged on ball joints and include either knobs and magnet catches or the push and release magnet catches.
Because my boxes are the same size, you can move cabinet doors from one cabinet to the next. One week you might want the lower cabinets with doors, another you might want the uppers. Or you might just order doors for all your cabinets.
The whole center is 8 feet long and about 6 feet high. The upper cabinets are cleated onto the wall into the studs, so they could be adjusted for whatever size flat screen you have.
This is an incredible storage piece at an incredible price.