What is the policy on borrowing for other mod?

It doesn't seem that there is a whole collection of modders to sort through when asking to borrow their work but I was curious if anyone knows the position on borrowing some units for another mod?

Pistoliers, Mortars, Empire Cannons, and some of the Border Princes units...?

I think some of the Border Princes units may have been borrowed from the Rusichi mod, so in that case you just have to credit them and they're happy to let you use their stuff.

Its hard to tell sometimes if the models aren't listed where they originated. I'm just trying to flesh out a Renaissance submod for Stainless Steel and some of the units here would fit in but I'm not sure how often the actual creators still come to twcenter.