I am running a 3 link but these sites should help and there are a ton of books out there to help with the setup. I will have spent less then $500 on mine when its done.The first book i would read is Chassis engineering by Herb adams.
http://www.racetec.cc/shope/
you can download a 3link and 4 link calculator here in the first post
http://www.pirate4x4.com/forum/showthread.php?t=204893
Here is a pic of mine but the panhard bar and coilovers are not in yet. May not help your design to much the floor on my car was junk so i started over. You probably dont want to cut yours up this much if it is in good shape.
