Detailing 1960s Ford chassis and undercarriages

[Monty]

At some point I'll be taking on the AMT '65 Galaxie for the first time since the early '70s.  Among other things, I'd like to make the chassis etc as accurate as possible.  I'm starting with the assumption that the undercarriage is sprayed in red oxide primer and the frame rails are semi-gloss black.  What's the best way to mask & paint these things to get the most accurate appearance possible?  

If memory serves, a couple months ago someone posted painting tips for making the frame look separate from the undercarriage, but I can't find the thread.  

TIA for all helpful suggestions.

[Rodent]

This thread?

 

[Monty]

That's the one!

 

[Rodent]

Haha. You are welcome.