Switching from Double wall to Single wall

[Ridnhi]

I am going to take a single wall top off of my 72 and put it on my 71 and I'm wanting to make it look factory. Basically, I'm looking for advice so that when I go to do this I don't over look anything. I'm doing this before the 71 gets painted so when I weld the nuts to bottom of bed rail I won't ruin the paint. I have all of the brackets for both tops. I know that I need to take the welded nuts off of the bottom of the bedrails to transfer them and move the dome light wiring but is there anything else that I'm over looking?