Heres more info as requested on upper bunk shelf;

The shelf is made of standard 16" wide closet wire shelf rack. Its "L" shaped
with a 2" back lip like this |______ I used cable to attach the shelf to the
pop-top but you could use any strong thin rope/twine. Attach the cable to the
top inside of the pop-top side where there is a thick lip. You'll see what I
mean when you look at it. Drill pilot holes and use sheet metal screws and
washers. It can be made removable by just making loops on the cable/twine etc
to hang onto the screws. It kinda looks like this;

                        : = wire cable  o = screw point

        side view of                            front view of
         wire shelf                              wire shelf
                     o           o                                      o
                     :           :                                      :
        o            :           :                                      :
        :            :           :                                      :
        :            :           :                                      :
        |            :           :                                      :
        |____________:           :______________________________________:

               ^                                  ^
               |                                  |
            about 16"                          about 16"
  ----------------------        ------------------------------------------
   side of upper bunk   |      |           front of upper bunk            |
  ----------------------        ------------------------------------------

Richard 85 Westy