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@Polka_Dot
Up to this point the helmet consists of just newspaper and PVA glue. This means the cost of the materials was extremely low and could even be a little lower if free-sheets were used. The 750ml bottle of PVA of which there is still some, cost less than two pounds.
The next piece of material cost about the same:
I bought this visor as a single A4 sheet of transparent plastic from a stationary shop. Not too thick so that I couldn't bend it to the shape I wanted and not to thin so as to tear or flop in the wind.
I cut a piece from the sheet a bit larger than what I wanted showing, cut a slit in the front rim of the helmet and slid it into place. It was a little bit fiddly, but not too difficult.