Where/How To Begin

[1968k20]

I purchased a 67k20 one owner last year. It had been rolled, so most of the body is dented.
The good: floor pans including 4th door pan and the outside of 4th door body. Also, I will remove the dash assembly. I can't use this as the build, beta amuse it was rolled on windshield and d/d wouldn't close. Rockers on dd,pd,and 3rd door no good.

I have a 72c20 that has bad floor pans including rust down through the 4th door floor. It will need rockers.

I am thinking to cut out good parts on 67 and use them in the 72.

Both Suburbans have the doors off. How would you guys start this project?
Or do I sell these and get a good body?