I plan to try strap hinges on the elevator (and ailerons). On the original Nieuport the rudder appears to be supported in a set of tail brackets. This is always a sticky part of WWI modeling. On my EIII I used a funky semi-scale sort of arrangement with a modified tail wheel bracket formed the top bracket for a wire that passed through a tube in the rudder and then into a gap in the tail skid support tubing (which was ultimately connected to the wooden tail skid). Maybe it's time to try some silver sodering on some nice brass brackets!