I've just retired and I'm currently working on a 19th Century Mod, basically Napoleonic, what ideas were you thinking of.
I don't have just ideas for Cossacks 3 lol. But anyhow, if you can make it like Hawk's European Warfare mod for American Conquest: Fight Back that would be perfect, what I imagine is to a large degree this mod combined with what Ftoomsh is currently working on with his ranked fire and logistical systems. Basically something big in scale and realistic/historically accurate. All I want from GSC is American Conquest 2 so this is made easier since a lot of these systems would be already present there.
I don't think my modding skills are up to Gexozoids standards, at the moment I'm just re-texturing the models, as best I can, to fit with the Napoleonic period.
I think I can lend you a hand if I have the time. Maybe we can work something out but I really want to be as close to American Conquest as possible, it's just my dream to have the game on the more modern engine. Hell I went as far as to even mod the game back in 2016 but as you can probably guess it's a pretty gruelling process and takes up a lot of time, something which I don't have of much right now.