Some info for helmet assembly and some references
ears
For higher levels clearance:
In regards to the teeth don't leave any paint on the gums:
Frown is painted gray and does not leave the teeth area.
And don't forget this for higher levels:
Fall of tube stripe tops ideally lean toward the front.
The "ideal" ear placement is as seen below, where the screws line up with the rear angle of the trap right above it. Because some armorers design their helmets differently or send them pre-assembled this is not always possible to achieve, but it is suggested that you try to get as close as you can.
Note: Top ear screws should ideally be located directly below the rear of the trap.
Some references of screen helmets, many had gaps