Mike, are you looking for photos of the Fordson WOT1 ambulance? If so, try getting hold of Military Vehicle Pamphlet 9: Ford WOT-1 by Mike Conniford, which has a couple of good external and internal photos. It's long out of print but you should be able to find copies on Ebay.
If you are not sure, here are some WOT1 fire engine pictures that'll give you an idea of what the WOT1 chassis looks like, albeit the ambulance version had the standard Fordson hard cab: http://album.sixappealwheel.org/view_album.php?set_albumName=album11