86 Burb need rear wheel tub ideas

[C.W]

So I new I had a little rust starting and due to a blown diff with a flip kit I decided to pull the leafs since they were sagged anyway which seemed easier to remove the spare tire well to get the rear shackle bolt out. Anyway turns out the rear inner tubs are BAD!
I also found more rust the shop that did the body for the previous owner must have thought wouldnt be seen if they hid it under new outer panels. So my dilemma is to scrap or proceed with my original end plan and bag it. I prefer choice #2
Can you guys that have done step notches and floor/ wheel tub mods needed please post pics and maybe a brief description of what you used as far as parts, etc?
Id like to save this truck rather than scrap it.