Even though it seems hard to make S10s look right im determined to do it for MCM 2012, I already have S10s with blue lenses using my own method.. (see picture below sorry for poor quality *taken with webcam*)
I went into town and bought some clear transparent blue acetate plastic, then with some help popped out the lenses cut down some of the pastic to cover the area they fill layering a couple of layers on each lens to make them less see through.
Then popped the lenses back into their housing and then back into the mask and boom cheap and easy way to do blue tinted S10s, can probably even do what everyone else I have seen already suggested and use window film on the plastic or something to give it a mirror coat if your after that look.
Now I just need to get the "vents" or "shutters" on them, after inspecting Capcoms bust of Vectors head (see underneith) it seems to me like the designer intended them to be similar to 'anti theft bars', mainly to keep B.O.W`s from clawing out the eyes of the wearer. Thats just make take on the design though as the bust makes them look more like bars than vents.
Anyways thats just my take on the s10 and the way to do it seeing as I too am cosplaying as Vector, seems the more people that do it the closer we all get to something that looks pretty damn accurate.