Order of assembly? From a bare shell

Hi all, I've decided to start assembly on 69 cuda. It's a bare shell, rear end is out.
The plan is to coat inside frame rails with cavity wax coating by Proform. Also apply Proform paintable undercoat.
I will prep surfaces accordingly. I'm starting at the rear and move forward. There are no body plugs, brake lines or cables or fuel lines. Just a shell.
Before I apply either of the Proform products should there be anything at all installed? Like fuel lines or brake lines body plugs? I have my 8 3/4, leaf springs front leaf brackets all ready to install once I get that area prepped and coated.
Any other tips and advice is appreciated.
No luxury of a hoist either, doing this in a shelter outside.
Thanks
Steve