I think the third R2 in that pic is a casting of the Revell Germany Episode III one. In fact I am pretty sure.
Shrugger, I found that small truck in your hint picture. Do you know what it is? I was assuming that you did... I've had several ideas for pooling resources, but I haven't had time to work on this thing. For example, to find a 1/48 Merlin engine (as in the Hurricane engine) for my 1/48 Y Wing, I went to a forum for 1/48 WWII plane builders. They told me that the only kit that had an engine like that in it is the ICM Spitfire Mk 9. Someone even sent me 4 sets of those engine parts for free because they never use them.
Here is another, though limited, resource:
http://www.ontheway.org.uk/
Click on "Kit Lists & Previews" and you'll find sprues galore, like on the kit scans page. Stick to Airfix, Hasegawa, Fujimi (re-releases of old Nitto kits), and ESCI (most, if not all, of ESCI's kits have been re-released by other manufacturers, e.g., Italeri). To find that kit, pay close attention to the front leaf springs.
I was thinking, we could take our pictures to other specialized forums to ask them if they know what kits we are looking at here.
I was also thinking of something else. I have an AMT Peterbilt Wrecker, and for the longest time I heard that that was a kit that was used on the Y Wing. However, I have been unable to locate any parts from it. The closest thing I see is a fuel tank half that would go on the top, forward of the Italeri Howitzer piece, and to the left. However, the part from the Wrecker seems too big. Anyone know about this? Also, I do not know what wheel is used for the base of the Ion Cannons, but the closest I can see is a wheel from the AMT Fruehauf Tanker from the Kit scans page. I do not have this kit, but I know that at least one AMT kit is used on the Y. The Sandcrawler has a lot of AMT Semi parts on it, so the Wrecker could very well have been available as the source of those parts. I think the 5 foot Falcon has them too.
I know some folks have been looking for those
