There IS a TIE Pilot chest box pep floating around somewhere, not sure who made it, but I may have a copy of it. It's fairly accurate, but wasn't particularly well constructed. I can try find it on my hard drive. Failing that, I drew up some plans of my own to construct like a pep file, which was designed to be easier to put together, which I sell on ebay from time to time.
If memory serves, the TIE helmet is a stormtrooper with a bit added, and the chest armor is just a plain body cast. I THINK a file for the TIe helmet circulated a year or so back aswell, come to think of it.