...but I know a workaround: we can make two entities and two identical squads with only other entities. These squads have a requirement for summer / winter conditions and be invisible if they don't match. The campfire has the same requirements already. That way we can use other models in winter maps
You sir, are a genius! I never thought of that before! This means that we can assign different winter skins to units even if they have a winter skin, right? Oh, the possibilities! Thanks for the discovery; I'll be sure to utilize it well.