When I did mine years ago the first thing I did was rebuild the hinges and then replace the body mounts, even thou your post is rotten and you have a broken bolt or two there should be enough there to get the doors squared into the opening,from there you can cut out the back side of the post, repair the bolt plates,patch and then fix the bottom of the door post, rockers.I think the body mounts is a over looked area most people dont think about first.When I did mine the inner fenders, floors and bottom of my door post were shot but I left the door post in place and then replaced all my sheet metel around it using sheet metal screws to reassamble everything making sure the doors fit the opening first before any welding started. Going back to the body mounts I had to use large washers to shim the body with the new body mounts,I guest its like a house if the foundation is sinking, fix that first or its going to be hell getting the door lines nice in the end .