The maker is not a member here, but many RPF'ers here have been to his shop. While I don't know the owner of the website, I think the maker of the kit uses the site for sales. If you want another option, I think his kits are also available thru Monsters in Motion.
**Edit**
Personally, I own a Tim Arp helmet, and wouldn't part with it for all the tea in China. Tim's kits are no longer available, so the next best thing is this helmet kit. If I didn't have the helmet that I own now, I would absolutley own one of these kits. IIRC, both have a lineage from an original Rocketeer helmet.