Try and make sure when building the eva that your pep comes with a visor (better if smooth) as well as a helmet that has folds. I ended up using 2 different files to make mine and ended up cutting out some details, oh well. having a helmet with folds makes getting the right shape so much easier. A problem my room made had with the visor is that it was smooth but slightly lumpy so the visor bent vision in a funny way. try and make sure that you have all your surfaces smooth and "flat"