Here are mine made.. they are also in my build thread if you want to check them out. They are the same materials, and same lengths as JCR stage 1 sliders.
Here are the brackets, made of 3/16" 3x4" flat bar. I decided to use three legs instead of the average 2 used on other sliders.
Next was to get the pinch seam all in place. So I took some finger claps and then drilled the holes in place and put the bolt and nut on. I used 6 bolts for the pinch seam.
Then I put the legs in place and tacked them to the pinch seam, and to the bracket.
Next was the slider, here it is hanging up on its own
Here it is all done and mounted
Testing them out, I think they work
Hope this helps you