Patching my 78 cab

[STOCKISH]

Instead of replacing the inner and outer rocker as well as floor extension, cab corner, kick panel, etc I was thinking about measuring 8 inches up from the top of the rocker front and rear and 8 inches in from the inner most part of the rocker and cut the whole section out from front to back with the floor section, toe board kick panel and all and replace it all in one shot. Hope that makes sense. I do not have paint on my laptop to take a picture and draw lines on it to explain so if anyone does and would like to help with that please let me know. Thanks.
Does this sound like a better or worse way of doing the repair.