Ready to install bed..have questions

[suburban99]

Be gentle please...
Truck is a 1962 C10 long box, with a 5.3 and 4l60 conversion. Truck is running now. I need to install the bed. Truck was in pieces when I bought it, but I have all the pieces...i think. We sat the bed on when I trailered it home.

Questions:
-Do I need to install wood before I re attach the box?
-I have all the crossmembers and frame painted, can I attach the box without changing the wood and have the cab line up?
-Patina on this truck is good with little rust and I have no intention of painting it...do I need to remove the fenders from the bed to install it?
In the picture the bed is just sitting on the frame..