This is why I built a drawer system and wagon gear tailgate lid

. Everything is self contained and locked away, axe and folding shovels fit nicely in a tailgate

and a cargo barrier would be nice but you then loose a sleeping area. Been wanting to build a fold up one for awhile. In the down position you could mount axe, shovel, AR

and then fold it up into the roof for sleeping.
On the flip side, nice job on the attic. I've always wanted to do something similar but would only place soft items in the attic, sleeping pad, blanket ect. It also helps to keep your COG low and insulate the roof.
You will notice now with your rack just how tippy you will start to become as you continue to add weight up high. It's hard to resist the urge to keep adding items with the new real estate... Been there.
Nice job, the process is always a learning experience. I'm sure you will change it all around 30 times before snake!
-Matt