If I remember it correctly the helmet was originaly a SunHelmet. I used a thin aluminum plate and fibre glass for the flat top.
Yes, there is a strap on the still camera lens.
The helmet is more rigid than a Protec. I've done about 30 jumps with it and I have not noticed any movement, despite using a bite switch.
The chin cup is made of some plastic plaster (???) that my ex-girlfriend got when she broke her thumb. Boil it for 30 seconds, fold it a couple of times and apply it to your shin. Hold still for one minute.
Oh, and don't worry. The neck brace was just for a fun picture.
/Mårten