Unsure about the padding, but I'll probably look in to the pad kits that OPS Core sells. They come in a pack of various sizes, so I'm sure some combination of all that will get this AirFrame clone to fit somewhat well.
Rails:
http://www.levelpeaks.com/store#ecwi...roduct=2876596
Head-Loc H-Nape:
http://www.levelpeaks.com/store#ecwi...roduct=2837164
Helmet Cover:
http://www.levelpeaks.com/store#ecwi...roduct=7258843