Sorry it's taken so long to get these pics finished. Here's a little tutorial of the finished item and how it fastens together. To attach it into the helmet is really personal choice, nut and bolt like the visor, hot glue or velcro.
I'll can only make 10 copies available here because of my current busy workload I'm afraid. They will be shipped inside a small box and wrapped in bubble wrap for extra protection. The price for these copies are as follows.
UK - £21 (including shipping)
USA - $37 (including airmail shipping)
EU - € 27 Euros (including Airmail shipping)
I'll pass I guess, not from the price but due to the smallness of the run. It's not at all critical to my costume atm so I'll bow out for someone more interested than I.