JK Aerotech has a P-47 and an F4U:
http://www.jkaerotech.com
JKA Kits are the toughest available. They are quick/easy to build and very competitive. Type either "JKA", "P-47" or "F4U" into the search box for this forum and you'll get an enormous amount of info on them.
The only P-40 kit I've seen is the WarZone P-40B/C. They also have a P-47 kit. Warzone kits are nowhere near as tough as the the JKA kits (mainly because they are hollow-fuselage designs). But, you can find more info on Warzone here:
http://www.rccombat.com/sections/man...one/index.html
Check 6 Plans has a P-40 plan set available. It is a great flyer, but is a balsa fuselage design that won't hold up well in combat. A that page is here:
http://www.checksixplans.net/
HTH,
D