http://www.composite-creations.com/index.html

and

http://dezso.homeip.net/NOLIMITZ/

and

http://www.billhempel.com/heads/index.htm

as for prop...

Desert Aircraft for Menz
and
http://www.troybuiltmodels.com/Propeller.htm
for others


Battery...
I would use LiIon and not LiPo...but that is me...
Battery to a switch to a regulator and then plug it in to any available port on your rx and then do it twice.....
Personally I don't feel it is necessary on a 50cc plane, but that is the way to do it...