Spent the last two days changing the right rear storage compartment. There was an original compartment built long and thin, good for water hoses, power cords and such but not much else. Plus it was badly rusted out. So removed it.
I had a new truck storage box with locks and keys. A bit shallow only about 15" deep but otherwise a close fit to where the old one was. I cut off the back of it and with some aluminum diamond plate I had left over from another project bolted the pieces in to make the box full depth from the outer skin to the frame of the bus 29 1/2" . Still needs a few details and paint, but fully serviceable now.