If you want to do the correct cover around and below the MQ1 circuit board, you'll have to cut the visor material like this ([USER=1]Art Andrews[/USER] can confirm this):
[ATTACH=full]206106[/ATTACH]
[ATTACH=full]206107[/ATTACH]
You can see it vaguely on the ROTJ helmet:
[ATTACH=full]206109[/ATTACH]