There are a surprising number of working, walk-in camera obscuras around the
world.  This page from the "Dead Media" discussion group lists addresses and
phone numbers for many of them.  You may not have to reinvent the wheel:
http://www.deadmedia.org/notes/34/340.html

David Mandel
Chief of Exhibits
New Mexico Museum of Natural History & Science
1801 Mountain Road, NW
Albuquerque, NM  87104
505-841-2832

          >I'm working on the design of an interpretive kiosk to be a
        >promotional presence on the waterfront of Liberty
        >State Park facing Manhattan. We wanted to include an
        >interactive/interpretive aspect to this. I've been
          >drawing and dreaming up an over-sized camera
        >(perhaps looking like the iconic form of a
        >field/studio camera) that you can walk into.

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