I recently started to make the focus tree. I started a communist path where the former soviet officials plot against Hitler and depose him in favor of a soviet leader. I also later want to expand the vanilla german focus tree with some foci that allow you to conquer the baltics and some of the balkan countries for nice and clean borders. If you have some ideas for foci, their name and their description then you can message me privately on steam or leave a comment on this discussion thread.

Mongolia and Tannu Tuva annexation? Or maybe a Communist-Fascist faction that is formed when they fuse?

maybe instead of force communism do it peacefully,maybe make a fused version of soviet union annex tree and germanys? also, can you make it so its not just the german flag when the union forms, the soviet unions a part of it, too

I think the "fused" version will be the expanded vanilla focus tree (the Rhineland tree). Both trees will most likely feature all claims (and maybe even more) that both nations already have at the moment.
The flag has the hammer and sickle in it which are communist features but you can always suggest another flag as long as you have the rights to the art and as long as it doesn't contain any swastika

Making Teuton-Slavic Union (annex Austria,Czechoslovakia,Scandinavia,Balkans,Swiss)