@lucpet: Awesome! Thanks for sharing the work in progress images; looking forward to seeing your final version of the helmet!
For the cloth: I used some superglue and sandwiched it between the ClothEye and ClothMouth parts like so:
The other parts that are in the image were for the facial prosthetics but I never completed them. They are not used on the helmet. Friction with the registration keys are all I used to hold the helmet together while wearing it (same for the face plate.) You could add some magnets to help solidify it if needed
Thanks for sharing the link!
-Joseph