I planned to use the bottom bunk to cover the passenger side wheel well and to hide my House batteries. As with everything else in the bus I have no idea what it's going to look like until I build it. Here is how the lower bunk turned out:
The disappearing wheel well.
Then a 4" deep storage tray.
The house Battery box is 28"X32" by 13" tall.
Lower bunk framed, the lid lifts up for easy access.