Nice bench, I like the bottom shelf set back like that. and the thickness of the 2 shelves on the top. I suggest using clamps on the loaders and powder dump untill you figure out how it fits your needs, otherwise your going to have a bunch of holes drilled in that bench. also depending if your right handed or left hand will depend on how you want them mounted.
other than that, its too small, youll see why in a month or so. if you got kids, make them bunk with each other or give them a tent in the back yard and take over there room LOL.
I have a 13x16 foot garage with a/c in the back yard and its no where near big enough for my loaders, brass hulls etc etc, its close when all the house storage stuff is out. which I plan on doing tonight after work since its cooling down.
Just realized something, add some better bracing to the front edge of the table, maybe some angled piece's coming off the side legs. lots of down force in that area., generally you want 1.5" to 2" of sood for the tops, I used 8 foot solid wood office doors there llittle over 1.5" thick.