Yes, some circuit boards were glass composite, while others are phenolic composites. The glass composite on the visor has no "gel coat" and the resin is slightly tan off white. But this may be from UV ageing.
As for the gap; External visors on pressure helmets need a way to avoid contact with the rubber seal while opening and closing. On Mercury helmets, this was done via an inflatable seal, which only inflated when activated.
Most other pressure helmets, us some type of mechanical system to articulate the visor down onto the seal, once lowered into a closed position. This is what the bail bar is for, and why you don't lower the visor with the bail bar.
In a Gemini helmet, there are some cams and radial tracks in the pivot mechanism that draw the visor into the helmet (Both straight in towards the face, and squeezing in from the sides) when the bail bar is lowered. In the ACES helmet, there is a gearbox inside each side pivot (rectangular box with radiused ends, inside the white "washer") The bail bar is attached to one shaft, parallel to the pivot axis, with a small helical gear. This gear engages another, which is perpendicular to the first, and when the bail bar is lowered, the second gear rotates against a pivot, which draws the visor towards the face, while at the same time squeezing it in on the side, forcing the visor against the seal.
If you look closely at the top picture of the whole helmet, where the bail bar in resting in front of the visor, note the gearbox is biased to the back of the opening inside of the white "Washer". Then note, in the closeup, where the bail bar is in the down, locked position, this gearbox is now biased to the front of that opening. This is because the visor has been drawn back against the seal.
If one was to pull down on the bail bar, with the visor in the "up" or open position, the gearbox will articulate the visor into contact with the top of the helmet and any further pulling on the bail bar will just damage it. The astronauts are trained to pull down on those white tabs mounted on the lower edge of the visor to pull it into the closed position, and only then, pull down on the bail bar.
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Funny, I just noted the date on my pictures, they were taken almost exactly 24 years ago.