1971 chevy c10 bed work.

[EJ71chevy]

Alright I have the bed off my truck and all of the old bolts that hold the bed together out. All I have left is to cut the welds at the tail gate area to take it all apart. My question is should I do this and work on each pice and put back together and is it hard to line back up correctly. It is a fleet style all metal no wood. I want to make sure all the rust is fixed and coated I don't want to do a half way job. Please weigh in on this forum with your opinions and experience thanks.