The designers went through the series piece by piece to produce a comprehensive model of Scotty’s facial structure and the way that it looked, both in his younger days during the original series and his later years from the films. It’s a fascinating look at how one translates a character from television to the video game arena, resulting in someone you’d be happy to ask to give you more power to the defense screens.
Source: Official Site; thanks to The_Grand_Nagus for the tip!