sizing

Hi there question, do floating faces affect the scale size in Pepakura Designer 3? Meaning if I scaled the helmet to my head size, would it be smaller, becuase the floating face is actually considered the top?? I'm currently trying to scale a Halo 4 Hazop Helmet, (link to the download Halo 4 -...

Im new to building and am going to be using pep to build, I ve made a handplate and forearm piece a while back but when I was looking and fitting it, the sizing seemed off , before i start with a big build I was wondering if theres a tutorial video or a diagram that'd help for scaling the armor...