Height, 41", width, 22". Length, as long as space permits but not less than 48". Plan to work standing and use a "bar" stool to work seated.
Strong shelving underneath. "Book Case" shelving on the wall behind, with at one shelf at about nose height to support a scale and make it easy to read.
Work surface of seamless material, OSB, Formica, Masonite, etc.. Finish any absorbant top with at least three coats of marine polyurethane.
For a right hander, put your press, case trimmer, lubrasizer, etc, where it can have at least 14" of clear space to the left. Consider installing a 3 1/2" swiveling mechanics vise at the left corner, good itself and also good for a temp "clamp" mount for some tools such as case trimmer.
Install your press with enough blocking to raise it high enough for you to fully depress the lever without bending over.
Install at least one multi-outlet power strip for electrical access.
Install a paper towel holder where it will be convient.
Assemble all stress point with screws/bolts and glue, not nails.
Put at least one 48" twin floursent light fixture above the bench, align it with the front edge of the bench so light shines down and forward.
Locate a trash container near the bench, where it will be convienent to reach.