Not yet practical to do fresh air in the mailslot. However, I painted in my mailslot and removed the plastic insert first. Remove all the plug type retainers holding the metal hood latch mechanisim and the plastic front facia. I think about eight plugs. now, you can pull up on facia and with hand begin to release the six long plastic catches. They release up and down and alternate. IE, first one releases up, next one down, next up, next down and so forth. Hardest part is geting your hand or a tool in there to encourage the tang to release. After I got it out I ground down slightly the six tangs that retain the insert. Will make it easier removing next time if I decide to paint in mailslot again. I included a pic of the car below. Good luck.
http://www.camaro5.com/forums/pictur...ictureid=11321