Midget,
Safety first, buddy.
In the event of a rollover/endo, your helmet may be slammed around hard enough for the shell to be distorted/broken, etc. Your cage looks like it needs a horizontal "containment" bar, ie, a tube of similar size welded to the vertical parts of the cage at noggin level.
Better to add that bar to the cage, than to add a titanium plate to your melon . . . . . Wiggle pin didn't think he needed extra bars in his cage, and he has a ribcage full of titanium now, AND, the rebuilt cage has the extra cage bars anyway . . . . . . . . . . . Mini Maven also got T-boned on track and seriously injured. These are just 2 guys we know locally . . . . . . . I'm not even going to talk about the 2 bad crashes I've had . . . . . . . Sh*t can happen . . . . . .
I know one can't foresee every possible negative situation, but you don't want to be on the low end of the bell curve either . . . . . or willfully ignorant.
JMHO,
Fordboy