Can someone please tell me what ineed to build my own wheel is cause my friend just startet playing but he doesnt have money hes like 13 so he wants me to build him o9ne i wish someone had a site with the tutorial or what ever please i will like to say thanks to who ever help me sorry bout my english im taking english class lol

If you have no experience with electronics, then don't bother.

The raw materials you'd need, the time invested and all things considered, you'd be better off just buying your friend a Logitech Driving Force Pro (DFP) wheel for $80 with some of that $500 you had left over from your G25

The quickest way to make your own wheel is to use a old one as starting point.
From there you can start to modifify, change the wheel, change the steeringshaft, the bearings etc.
On my G25 I changed the wheel and made some extra buttons but I'm planning to make more changes.
http://www.lfsforum.net/showthread.php?t=27071