Im going to build a gun cabinet in a so called hidden place. Theres a small are in my closet that was left open. Its 30" deep and 18" wide, it also goes from floor to ceiling, which i wanted to build the cabinet 80" tall to have some storage area on the floor and 1 shelf up. So 30x18x80 is all outside dimensions. I just dont know what wood to use for this. I figure some type of hardwood plywood, but i figure i will need 2 sheets of it. I will not make a door for it because no one will know its there unless they know where its at.