Did the helmets, & included the chest detailing on a few of the figures. I decided against trying to do any additional detailing on the helmets like the crest since it would probably be pretty involved & tough to get to look right.
Now just need to finish the small pistol like weapons off & replace them with the Sontaran's rod weapon. Then they'll be ready for painting. Not sure if I'll try to do the light blue uniform color as shown in the prior post, or if I'll use the more classic dark grey/black color.