Here's a few more pics of the rear nocth and install (kkep in mind these pics do not include all pieces of the rear kit). There will also be tubular crossmember's that bolt-in between the notches to stiffen the chassis and add a little flavor!
This shows the simplicity of the design... use the supplied templates and existing frame holes to mark where the frame needs to be cut and where the new holes need to be drilled. Drill the holes, cut the frame, and slip the notch over the rails! Bolt-it up and there you have it.