My ODST is made from pep files. As to which ones, I lost track over time as it took me the better part of a year from start to finish. As to damage, most of it was around the legs, especially the thighs and lower legs. The lower legs are actually a total loss at this point, and I scrapped them. But in any case the primary points of failure were from the straps that were holding the lower leg pieces on. I had resined the piece but didn't do any further reinforcement beyond that as I was really pressed for time. After four days, the straps were tearing through the pieces becase they just weren't hard enough. I discovered some of my other pieces also had some chipping from points where you bend. Apparently, I'd broken off the bottom rim of my chest plate when I bent forward, but didn't notice till I was packing up at the end of the con! LOL. So basically, I just need to throw on more bondo and maybe use fiberglass mat next time. I admit I was being cheap and only put the bondo on areas I thought would take weight or impact.