Late to the party but...
The best way for yourself to figure out arrangement of gear is to see what you've got, figure out what's important and what's not, organize it accordingly, then begin laying out space storage. Take into consideration ease of access and prioritizing what goes where. For example: You'd probably want your recovery gear as easily accessible than your kitchen/sleeping gear for those "just in case" scenarios. So organizing the recovery gear above all your items, or putting it upfront for easy access should be priority. Don't forget to accommodate for passengers and their stuff, or just kick them out and tell em to go find their own ride if you don't want the extra weight.
Planning either a fixed drawer/cabinet unit has its pros/cons vs building a low deck where you'd still be able to utilize a large flat surface area to stack boxes but you'd still have to tie it down somehow. Everyone's either dialed in or is in-process of dialing in their setup so be aware of constantly changing storage organization. I went from open trunk, to two storage boxes (kitchen and recovery/tools), to a fixed drawer storage system that fits my needs on my adventures. Would I change anything now? Probably not as I've got mine pretty much dialed in.
Like was mentioned before, if you can, definitely come out to one of our events and check out all the different setups each rig is running. There are such a large variety of what people's needs are, so be ready to take plenty of notes/pictures for your setup. If you've figured it out, post some photos of what you've come up with!