I'm doing something similar with the Trollbloods Mountain King for a Troggoth Hag. I might stick a shaman on his shoulder, an idea mentioned a few pages back. I dislike the FW model and love the Mountain King, who is on a 120mm base whereas hers is 120x92mm so close enough.
Speaking of, what are people's thoughts/experiences with the Hag? I question whether she's worth the points vs. ~6 rockguts + 1 shaman for 400. I do love big models though. Below is a compilation of her full HP profile & degraded profile vs. 6 rockguts (because I like them more than fellwaters). All against save of 4 rerolling 1s:
Happy hag:
Sad hag:
Two units of 3 Rockguts:
Their profile includes the boulder throw (2x 50% chance for d3). Seems like their lack of degradation plus higher damage, along with a shaman for magic, might make it an even trade.