This is the only parts i have really made on my own other then bracket for holding the IC and a cart for parts:
S13 Hatch Harness Bar Version 1. Cost me $25-$35 to make using Steel from various places.
I have since changed it, and added pieces that go off the cross bar that for where the harnesses bolt to. And Things off the back that have 1/4 steel bars that go down and bolt to where the rear seat belts bolted to. I will take new pics later.
I also made some custom reinforcement for my clearanced S13 bumper stupport using 1 1/2 inch angle iron.