This project was started 16 years ago. At the time I didn't have the experience to do the welding so I farmed it out to someone who had done some others. I don't know what he used to determine the kick up in the back but I have plenty of room for suspension travel. If you want I can take some measurements for you.
He used 2 steel building I beams lay-ed parallel to each other and level with each other to build it on. I had already stripped my frame of all the other suspension.