Order of assembly? From a bare shell

You can spray down the quarters but it don't cover as good as when you fill them .Take a scope that has a LED screen. They are cheap at Harbor freight and put it down in there. You'll see the rust that the spray didn't cover.

And if you have a patch welded in. And the seams are over lapped the seam gets filled also. When I put a lower quarter on I over lap the seam on the inside with the opening facing up you can let the paint flow right in. When you weld a patch on that is the first place it starts to rust is at the weld that you cannot get to on the inside of the seam. Fill the quarter you fill the welded seam. even across the bottom.

I'll take some pics of the screen when I put it down in the front of the quarters. My rears are already done. You are not going to believe the rust down in there. Ray Barton was having cars heated to about 300 degrees burning every thing off and dipping them in a stripper tank then dipping them in a neutralizer and paint.

That is the only way to stop the rust that you cannot see or get to. Unless you fill some of them up with a rust inhibitor

. I am selling the brown Duster so I am using Rust-o-lium its 6 times cheaper. My Demon and my Orange Duster bodies will be fill with chassis saver then drained even the rails. Its $40.00 a quart. Probably needs 4 gallons and you throw out whats left. Unlike rust-o-lium that you can reuse.