Remember too that anything you attach to the device will add weight sticking out in front of your face, depending on how you set up the "armor," it could end up being a lot of unnecessary weight.
Tethering is good, I prefer a tether that's mounted slightly offset as opposed to straight down the center, I had a NOD break free on a center-mounted Wilcox tether and it smacked me in the face on the way down. Better than shattering on the ground and/or getting lost, but still not pleasant. Fancy tethers look nice and all... but a little bit of 550 cord and a small "S-biner" will do the same thing, and frankly is more personally confidence inspiring to me than the thin little string on the Wilcox. To be fair, this is probably based solely on looks/feel, and as I've said, I've personally experienced the Wilcox tether doing its job when I hit something with enough force to activate the Wilcox L4 G24's breakaway feature, but the PVS-14 itself survived and worked just fine once I re-mounted it.
I've seen some guys wrap their NODs in CamoForm (camouflage printed friction tape) that adds some extra padding without adding much weight, but have never found it necessary personally.
P.S. if you use duals and use bungees, you are basically almost guaranteed to end up with a bloody lip if the breakaway ever kicks in.
~Augee