Man you don't have any idea of how big the can of worms you're wanting to open here. designing a 4-link coil suspension from scratch is something that has to be right or it will be scary bad on the road, and on the trail. IMHO if you are asking questions on where to mount links, and how to put this together. You have no idea what you're doing, and should either think of just buying a already made kit, take it to a suspension shop that knows how to do what your wanting, or just leave it alone. My suggestion is to just leave alone. If you have ever driven a full coil (4-link with a track bar) vehicle off road you will find they have a funny handling characteristic about them. Personally I don't like it, feels like the ass end is falling out from under it. I'm not trying to be an asshat here, but just trying to educate you on what you're getting yourself into. Designing suspensions form scratch is something that takes know how to do. At the very least if you decide to go though with it get someone that has done this before to guide you through it.