i have some experience with this weight paper, i have done my Thomas Bangalter (Daft Punk) helmet, i will reinforce inside with some carbord stipes, i will make somethink like armature inside it that u can hold part on those stipes and it will revent from folding in or deformations. im studying mechanical engineering in second in university, so i have so knowlledge how materials and reinforcings behave
if worst scenario ocures threse is always some rondo or bondo tha i can use.