Step 6: Add details
The dent on the top of the helmet and the two small triangles on the front were then cut out with an X-acto knife and then a piece of cardboard was glued onto the backside. The dent was then filled in with spackling paste. The rangefinder was then constructed from folded cardboard sheet and then glued together.
There is also a panel that gets glued onto the back of the helmet. This is done by cutting out a rectangular section in the back of the helmet and gluing the panel into the inside of the helmet.