Oh, I’ve read and replied to the private message first, but since my answer is more generic I post it here for others aswell. ^^
I am not using Discord at all. I have an IRC Channel, and that is pretty much all I got until I switch to Matrix instead later on.
As for Music and Stuff, the way I will handle it is similar to Resource Packs, so anyone can just bundle up their Music and post it like a Mod. This way anyone can add the Music they like.
People will be able to choose a lot of things to download during the initial Install Process, and Music would be part of the things you can choose from in it. ^^
As for GT7, feel free to try porting it, there is others who already are porting it to later MC Versions right now. I would contact @Muramasa for details if i were you, before starting all the Effort that has already been done. 