Ride Tech sells a complete do it DIY weld tri.kit for $450.00 or a DIY weld par.kit for $550.00.They come W/all the componets needed to DIY.No lookin for parts,Can't go wrong there.
Jerry Bickell race cars used to sell a video telling you in great detail how to set up and design a four-link. I watched it a couple of years ago at a buddies when we were building my tube chassis camaro. You likely want a setup for cornering and his shop builds high end drag cars, but you might get some good ideas.