Well, I believe Hot Toys is doing 1/6th scale Terminator figures right now. The last version didn't use the "Guvunata's" likeness on the figure though probably because of what Bluesparrow mentioned. They did do earlier versions though with the female and Schwarzenegger from T-3 I believe. Also Popsalute did a Terminator that included the coffin full "o" guns from T-2.
By the by, if you'd like to make a Terminator figure you might consider picking up the bbi bodybuilder G-3 figure. It's the spitting image of "Ahnold". And I mean it's really him, not a passing resemblance.
If SSC could get the 1/6th license for one of the films I'd be thrilled. The Hot Toys are great, but expensive and can be a pain to get what your looking for. I believe SSC could do the line justice and provide the widest variety of figures/characters in a good quality and affordable package as they are doing with SW now and have done with lines like Bond and Buffy. It would be nice.