Balanced at 7 stones? Yeah, maybe if they were Walk 6, had more wounds and/or Feed Piggies wasn't 2 AP...
As for the Bug comparison, I'll be honest and say I've never run them but I don't understand how people are being so dismissive of them. Neat as hell 0 actions, more wounds, Ca 6, Walk 5, armor piercing. There's a lot to like there.
In fact, I'm thinking Survival of the Fittest for Tinkerin' and Do It Like Dis' for their triggers might make them tasty on a Somer list.