Well, at the moment I've added swastikas to part of german aircraft and I'm planning to add it to the rest of vehicles, without overusing though nor making them too big. Just the way they were placed.
For clothes, I would need first help from devs as I've had a hard time trying to even find out where the helmets are placed. In addition, Matthew Baker has retextured the german flag and it looks pretty great.
However, I'm not really going to touch whatever was made by Rad as I've got an huge respect for that man.
With the permission of devs, I could release it as a texture pack some day. (Keep in mind that I'm doing this as a world war two fan and I haven't got any relations with National-Socialism)