Freaking awesome H.U.N.K costume. I only spotted two mistakes - he's using an M16 and H.U.N.K uses either a Steyr TMP or an MP5. Also, he's got the logo of the U.B.C.S on his uniform, (Umbrella Biohazard Countermeasure Service) and H.U.N.K belongs to the U.S.S (Umbrella Security Service).
Apart from that, however, it's absolutely fantastic.
I'm just sorry I couldn't help out a fellow cosplayer more (from the looks of it a lot of that stuff, if the guy didn't make it himself, then it would have been commissioned from someone who knew a lot about plastics and fiberglass I would guess...it was an amazingly detailed costume though! If I see him again I'll ask more about it lol)