I built this in my basement recently. I framed it with mated 2x4's, 3/4" plywood, 1/4" Masonite work surfaces, and edged the top with 1x3" maple.
View media item 7859
The doors are Masonite that slide in channels cut into the 2x4's (I made the top channel deeper so I can lift the doors up and drop them into the bottom tracks). The door under the bandsaw is hinged.
View media item 7861View media item 7860
The Masonite top is screwed atop the single sheet of 3/4" plywood. I used countersunk flat-top screws because didn't want to glue the hardboard down.
View media item 7919
I primed and painted the bench, using gloss black laytex. Black gets dirty, but I was trying to match a metal bench I already had in the opposite corner. But I would recommend using a dark gray instead to hide the dirt and dust.