I think you want the brew kit on the passenger side,or you will be next to the traffic if say you are in a laybyOn the drivers side I plan on having the JetBoil and associated mugs and food utensils plus anything else to do with food, on the other side, at the moment, I plan on leaving it open for access.
I intend making the cubby fit right down to the wheel arch and put a floor in it at hatch level. I can then either make that accessible through the Gullwing hatch, or from the rear by lowering the tailgate.
I was thinking probably a combination of ally and MDF. I don't have access to a bending machine so I thought MDF panels with sheet ally attached where necessary.
I'm amazed no one has suggested an optix and bottle of scotch