NibblesNibbles, 13 bytes

^3`<^4`:;^6`<^5"/\\"\$

explanation

^3                     # replicate 3 times
  `<                   # sort
    ^4                 # replicate 4 times
      `:               # list of two lists (for getting newlines)
        ;              # let (save value to $)
         ^6            # replicate 6 times
           `<          # sort
             ^5        # replicate 5 times
               "/\\"   # the string /\
                    \$ # reverse the saved value

Note that that last $ can't be omitted because in the binary form the sort needs to place more data after its arg