I just took a look at the TV History website for some info and found a sister set. This must be the high end version.
Now that I know what the missing control door looks like, I figure I can fabricate a reasonable facsimile. Perhaps take a piece of clear plastic stock and cut it down to size. Maybe put some bevels on it too. Then, back paint it with gold/brass. Perhaps even apply a replica logo water slide decal. Finally, glue on a couple pins for the hinge.
