Hey, my girlfriend is wanting to build herself a set of Carolina armour too. We're both really new to this and thought we'd start by building some helmets. Would you mind sharing your pep files?
http://www.405th.com/showthread.php/24086-*The-Official*-Halo-Reach-Pepakura-Files-Thread
http://www.405th.com/showthread.php/8172-The-Pep-Index-(wiki)
http://www.405th.com/showthread.php/26285-All-in-One-Halo-Pepakura-Pack
Just remember to scale the armor to fit your head correctly, there are lots of great tutorials on this site!