Okay, so here are a couple of pictures of my Rifle Range Box - It's basically set up to be a combination reloading and cleaning system.
I got a basic Kobald 2 drawer tool box and lined the bottom. Got a block of Aluminum T-6061 and drilled the side of the tool box, tapped and threaded the block to hold both a powder thrower and a gun vise if needed.
Plenty of room for everything I need for a day at the range short of lunch. At the end of the day, it all packs up in one, nice, neat package and it can be locked should I desire.
Hopefully this gives you some ideas of your own.