At least it's a straight shot from the frame to the sliders.... 1st Gen sliders are definitely a challenge. If you want them to be functional and hold the weight of the vehicle properly, I think they'd have to have a triangulated component to them. Basically tubes to the rocker from the upper frame area, and from the lower frame area....converging at the slider itself.
Most likely there should be new crossmembers directly behind the mounting plates also....to help prevent the frame from being ripped in half at the mounts due to all that leverage at the slider.
Like I said......possible, just complicated.