Looking at Converting this broken 96 Don Post, when I got it it was craked in several places, it had a broken rage finder.
I started by cutting out the plastic in the visor area, glued the range finder, I also cut out the keyholes.
I also made the cover for the top of the rangefinder wich was missing.
Once I get it all sanded down completely I am going to put a metal band inside the helmet to give a better shape. maybe roto cast the inside