I think that funny looking apparatus in the floor to the left of the office chair may be the base to the periscope and there's a hatch that opens in the roof. If you look at the pic of the driver's seat from driver's door it says to check for 'scope down' before moving vehicle.
Also, I like the big no smoking sign. That's funny. Hard to imagine the sleuths not chain smoking on stake-outs after all the spy movies I've seen.
Eric, that link is awesome. All sorts of fun stuff available out there!
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