(I think Warmoth are excellent and for the time being will use their necks until I have a lot more experience & confidence)
OK: http://www.guitarplansunlimited.com
http://www.guitarbuild.com/
http://www.buildyourguitar.com/index.html
http://www.mimf.com/
http://www.guitarfrenzy.netfirms.com/index.htm
http://www.guitarattack.com/mattocaster/sagakit.htm
http://www.belmanguitars.com/
http://www.guitarnuts.com/index.php
Don't get me started...LOL
Have fun.
Robbo