What's the best way, since the firewall has to sit just right to the body edge? Do I install the firewall centered and properly placed then let the body fall correctly to it? Or should I get the body in the right place then let the firewall fall where it may? Well that affect the lower corners placement and other aluminum thereafter?

Tips and points would be appreciated. Or a point to the right thread (I looked through all threads here and didn't see one, but I have been accused of being blind, plus I'm kinda watch Christmas vacation right now so I'm a little distracted. Lol)