The biggest problem in playing Robin Hood nowadays would probably be finding a large enough surviving part of Sherwood Forest!
I used to pass one of those "Indian" camps in summer on the train when I taught at Siegen. Like some other posters here, I never regarded those Germans as anything other than harmless eccentrics. The "Indian" life, which they play at, was really just a fantasy created by a penny dreadful author. I think that the Cherokee and part Cherokee people whom I know, would be more inclined to just smile at them.