Inherited 71 GMC Truck: suggested Mods?

[TomShilling]

Hello! My first post as a new member: thanks in advance!
I have inherited a 1971 GMC 1/2 ton pick up. It needs some help. It is all original with a 350 invader, but needs the following: L and R lower rockers, new steering wheel (an easy bolt-on with no adaptors), new Seat, new rims, lower tailgate skin, and Major dent repair on the pass side bed in front of the wheel well.
It is pretty solid aside from the lower rockers, and I have seen cab corners as replacement parts: is that the lower truck cab where the bed joins the cab? I may need those. Mechanically, she is perfect, just had the brakes done and with a few upgrades, she'll be fine.
Again, any suggestions on where to find these items, best pricing, and any tech tips would be appreciated. I am posting a few pics so you can see what I have to work with.
Thanks again!