Check around at lawn mower shops, Most of the time them have piles of old chain saws and weed wackers you can get for around 5 Bucks

Making and mounting prop hubs is no big deal if you have a lath or do some looking around on the forums for links to people that make them.

Ken Lambert makes some parts
http://lambertsrc.homestead.com/

Also can get some here
http://www.brillellicustoms.com/

Milton