I for one absolutely love the Spiderfang, they, just like other Factions have already done, just need updates. Not even that many.
The Arachnarok is still a literal beast of a kit so much so that my arachnaphobia is set off sometimes by them.
Update the Spider Riders and Spider Boss, add in a medium sized Spider as a unit of 3 and maybe an infantry option and that subfaction is complete.