Looking For Help And Guidance For Outer Floor/Inner Rocker Replacement

[MCSETots]

Attached are a couple of pictures of my lower hinge/A pillar and my lower latch/B pillar. First, I would like to remove the outer floor/inner rocker. The inner rocker is sandwiched between the cab supports and the lower pillars with spot welds, bolts and nuts. I am looking for a way to remove those pieces of the outer floor/inner rocker and replace teh outer floor/inner rocker with the AMD/Tri Plus outer floor with inner rocker panel (part number 406-4067-1R). I am trying to avoid having to remove the lower pillars, since they are in relatively good shape (and avoid the extra work and cost of removing and replacing). For reference, I will have to replace the lower section of the kick panel and the lower portion (about 3") of the cab corner.

Looking forwared to hearing back!

MCSETots