Luckily I'm a pep hoarder... :)
I've only got the obj file, but it looks easy to unfold. You'll just need Designer to do the unfolding.
Dropbox - High Res RC Helmet.obj
Hope this helps.
If your town or city has a firm that does commercial printing - wedding invitations, calendars, etc - they will most likely sell you card in a variety of weights. Our local printer sells card at half the cost of the office supply companies. Ask for uncoated paper as it absorbs the resin more easily.