The head works pretty well without any internal structure but if it was to be worn for a full performance holding the head in the correct position would become tiring and would also restrict the range of the movements of the wearer.
So now the head is finished I have designed this simple structure that would attach an old hiking backpack with a wooden inlay to piping paper mached to the inside of the mask under the arm holes.
Here is the design:
I made a similar structure for the dragon puppet in first year which was much heavier than this head so im confident this would work well. That design was essentially the same only the copper pipe attached to the back pack was going straight up instead of infront.
I was also donated this already recycled wadding made from old plastic bottles that I would use to pad the wood inside the back pack to make it comfortable for the wearer.
To cover the back I would just add more hair tassels to make the back of the puppeteer blend in with the rest of the mask and complete the illusion.