I don't know why the scale is a little off but that's how I got it from Fraz. I just measured the rough distance on myself and put it in assembled height. It turned out to have a scale of 640-something if I remember correctly. So it's not the same as the MC.
Update on the helm. It's pretty well smoothed with the visor installed and ready to be detailed with bondo. I'll smooth everything over again once I've finished the detailing.
I carved out the detail lines with a knife as best I could by looking at Doom's reference photos. Then I used my dremel to make the grooves deeper and bevel the lower edges. The bright white lines are the actual grooves, the rest is just where the paint is sanded away. It looks like I'll still be needing some bondo though. Do you guys think this will work?