Thanks!
The straps kinda look like they are on top or act as suspenders. You can see they have a buckle on the front & on the back on top of the plate carrier. But I would assume they are modulare and just an addition to the RRV.
So for the straps i would get, molle buckles, 2" nylon straps , some plastic shoulder pads (2-3 each sides, reverse the middle one to rivet the rail on them).
http://soldiersystems.net/2010/05/23/molle-tee-mount/ (probably DIY since they dont have 2" models but in the game they have HUGE buckles)
http://www.hudson4supplies.com/en.us/product-6539
then cut or straighten these helmet rails (below) with heat. he always have his right side free so you can see its these rails, but on the left side, it looks like he has something mounted. It used to be a personal mini missile launcher (back when they announced the game), but now i think its suppose to be a UAV transmitter or some kind of technology of some sort.
http://www.popularairsoft.com/news/a...y-airsoft-park
I tried to find a clear pictures, you can see a little bit, its not Kovak but the MP Rifleman who uses the same vest. You can see the attachement points. They are big, my best bet is to go with big 2" buckles.
For the fast mag, here is a photo, I never owned fast mag so...