Every pepakura file is a pepakura file, meaning it is intended for cutting out with cardstock. You can either turn off tabs and use the pepakura files like that for foam, or you can just use them as visual reference to freehand your own foam file.
There is a section for specifically foam templates on the 405th 4shared last I checked. There is a link to it in my signature and it should be where you look for halo files first!