We've been discussing this issue in the sculptor sticky. Here's a few things regarding the mask that should be understood:
-sculptor-chan doesn't want to do a full Moon Man mask for fear of copyright infringment
-Making a mold and copies of the mask is very costly
I would suggest making a face mask version of Moon Man in a 3d modeling program, that way I could 3d print it, and start making masks that way. Sculptor–chan is worried about copyright infringement, however I'm doubtful Mc D's will really care if there are face masks out there that have the same features as one of their mascots.