Well the mod ID is hidden you would have to ask the skin creator to give it to you.
And yes you need to add "_summer"/"_winter" behind the ModID.
Oh of course, actually seems pretty obvious now. I had always planned on asking permission or just making my own skins, just wanted to see if it was possible first. Thanks a lot for your help you probably saved me a lot of time, I am pretty new to modding so there has been a bit of a learning curve. Cheers
Relic Entertainment
cblanco ★ 
보드카 중대 
VonManteuffel 
Heartless Jäger 
