This SolidWorks model is to scale and resembles the outside of the origional helmet. All scenes, textures, assemblies and parts are included with this download. Please let me know if I can provide you with a different file extention or modify the model to your liking.
STL (Stereolithography, filesize: 28.9 MB), SLDPRT (SolidWorks, filesize: 28.9 MB), IGE (IGES, filesize: 35.7 MB), OTHER (Other, filesize: 32.4 MB), STP (STEP, filesize: 28.9 MB)