Those casters will go on the table. It will make the large table easy to move for cleaning and maybe special processing.COOL, will it have the casters in his new home or were they for something else?
For some shop shots, here's some process photos of that table. Not as awe inspiring as some of the projects above, but it was a fun and challenging project.

cutting the mortises in the legs

cutting the tenons on the apron boards

Pressure gluing the fastening cleat to the apron boards

Long side glued up

inside detail

Frame glued up and being lacquered. The thing under the white sheet is the jointer. It doesn't like overspray.

Portable power tools used

top being trimmed

corners being detailed

Top detailed, edge sanded and ready for a finish on the edge

Lower shelf being cut.