Wes, I guess I got a message from you regarding P-40's. My email has been messed up and this site does not have any messages in my box, hence the public attempt at a reply. I'm not aware of any P-40 kits smaller than the Top Flite Gold Edition. There probably are or were some 1/12th combat kits. That would be pretty small for anything but a Fun Scale model and those kits are pretty far out of scale. I have a 1/12th Typhoon that flies with a .25, but the Typhoon was a lot bigger plane than the P-40. Did you try the Model Aviation and MAN plans archives?
Chuck