Still have not decided on the wheels/casters. If I go with the actual wheels I might just use go kart wheels, if casters I like to use ones similar to the type they use on the HD flat wagons(I know those will hold weight) and as far as the actual size goes it will be 82" wide x 24" deep x about 5' tall. I have both side lockers, and the top/lower cabinets. Just need to weld up a frame.