sorry dont know that much, but the NMS cable i dont think is made anymore, and the flat smart house wire with coax and 12awg and class 2 & 3 cables in the jacket i thought they went out of business too. check this article out, its several months old but has a point of contact at UL and summarizes things pretty well http://www.ul.com/regulators/ode/1001.pdf
and this is a SCS system self-promotion but has some good info http://www.home-cabling.com/design/white-paper.pdf
walker duct and 4000 series divided molding are ok and using barriers might be ok too. depends on what the 16awg is used for? class? txfmr?
6mm separation might work..... 1/4" ??? i've heard of that before ???? must be some kind of archaic measurement system [Linked Image]