I guess you mean photo 4 not 3 as 3 is of the underside of the tail section of one indoors.
while obviously not as conversant with the CA-11 and construction techinques of them ( wouldn't have recognised those without prompting ) I am amazed at the variety and amount of other aircraft visible in some of the other photos from that site.
in just that small series I have managed to identify oxford, mustang and anson. the rest of them show other types too.
there are a couple of pics from that site which have me very curious though. In Buz Busby's photo group for photos 5,6 and 7 ( link at the end of this ) there is a structure in place in front of the cockpit of a very early model P40 and it has me wondering what it might be.
http://www.p40warhawk.com/WW2_Era/BuzBusby/BuzBusby.htm
and yes it is a great pity that the govts of the day weren't a bit more history conscious despite the statement in the newsreels of the time of how momentous and how things were the largest of their type ever and so forth and save at least one of every airframe. oh well, no use crying over spilt milk