It is more than that. You have to cut the holes for the body mounts into slots that go around them. You need to add a spacer plate that hits the raised section at the rear of the torque box to bolt that up tight. Then you need to add additional holes to the top part under the doors to get enough fasteners in them not to move.Yeah I would copy the savvy bolt locations on the bottom and drill some holes, use nutserts in the torque box. Seems like that should turn the PS sliders into something more decent.
By the time you do all of that, you have enough invested to easily start over.

