We used the same stats as in the original games (WC2/WC1), adjusted by some global scaling factors used in Standoff (ie, all damage, armor and shields are multiplied by 20, because a ship with "80" armor is fine in WC1, but in WCP it would instantly die from any collision even at 10 kps).
Note that these stats don't always match the source material for those games... we used the actual stats from the game files, not from the manuals.