do the balistas appear in the skyrim ruins with db installed, kinda like how dg put chaurus hunters in existing falmer lairs?

also, can rieklings appear in skyrim areas during combat if you sided with them at thirsk?
i dont mean actual riekling lairs added in the vanilla area, just the random occurrence of the 3 that sometimes spawn in combat situations

Nope they sadly do not. I have explored dawerven ruins and found nothing but that could just be me and no signs of rieklings at all.

edit: you can find bandit leaders wearing nordic armor at high enough levels though.

nope only the secretive and previously unknown dwemer of solstheim thought to have a dedicated and devasting ranged animunculi.