I noticed your bench lacks a toe space. The base should be indented from the front and sides of the unit. That way people wont be kicking the bottom as they walk up to it. Take a look at the base of kitchen cabinets and you see what I am talking about. Generally, when you walk up to something, your toes stick out more than any of your lower body parts and it's awkward to walk up to something and befor you get yourself maneuvered into a sitting position, your feet kick the bottom.
The toe space or what ever it is called can be as simple as a frame of 1 X 4's with corner gussets to screw the box to.
Also, that lower frame can and usually needs adjustable feet because most floors are not level.
The inside of the box should have some kind of access so you can screw it down and also for storage. This does not have to have a hinge on the lid, just a simple access hole. Typically on boats, you cut the hole, frame out the inside of the hole with 1 X 4"s extending 1" into the hole space. This provides a lip for the cover to sit on. The cover is the piece you cut out and drill a finger hole or 2 to remove the cover.
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B
Last edited by Tony B; 02-05-2016 at 08:10 AM.