I went around the helmet and filled any gaps with silver silicon and then smoothed them all out, this really made the helmet strong and looked smooth.
The lights were run using a 12v 8x AA battery holder with a jack plug connector going to the helmet and the suit. The Discs on the back of the suit also ran from the same power supply.
The Helmets were wired with a separate on/off switch to enable us to leave the suits on and reduce glare from the inside of the visor. it was pretty hard to see walking around a festival at night with the helmet lights on.