I'd hate to see you buy a bad radio from EBAY. There is some real crap there as well as some good stuff admittedly. It takes a bit of experience to sort it out well.

As for plans:
http://www.rcmmagazine.com/store/sto...vGxQCMpmI0i4c2
http://www.modelaircraft.org/plansmain.asp may need to join AMA to obtain these.