How to craft anything from fiber glass composite

Hi, everybody.
I wanted to test and show you a very promising technique of attaching tin miniatures together. Unfortunately, both my Infinity starter pack and materials I've ordered for this experiment are still travelling to my post office. So this time I will show you something else.
This summer I was attending a huge LARP event dedicated to Warhammer FB universe as a dark elf, for that I've crafted several druchii helmets. This post describes the full technological process with some photos. You can use the same technology to make any parts of your larp or cosplay costume, or enything else that should be relatively lightweit, be able to withstand some mechanical punishment and have a more or less complex shape.

Tools and materials:
polystyrene foam - same you would use for terraing crafting;
double-sided adhesive tape (non-fabric);
sanding paper;
utility knife;
foam cutter (optional);
light fiberglass fabric (about 50g/m2);
fiberglass matt;
epoxy resin with hardener;
polystyrol resin with hardener;
a lot of basic cheap paint brushes;
mold release wax;
scissors;
respirator;
electric drill;
electric jigsaw;
a set of m4 nuts and bolts;
utility gloves.