Poisoned Wind Mortar conversions

The Poisoned Wind Mortar from the new Skaven army book is one of the better new weapons teams, but there is no model for it. So I went and converted 3 teams and will hopefully try them out this week.

Move and Fire, 6"-24" range, fires as a stone thrower, wounds anything in the center on a 4+, and anything touching on a 5+.