My main bench is framed with 2x4's with 4x4's for legs and 1" plywood for a top with a shelf underneath made of 1/2" plywood. My Lyman 450 is mounted on the left bench which started out life as a sewing machine table and now has a chunk of 3/4" high density particle board for a top.
Gotta upgrade those two old presses with a 550 someday.....