Lens time.
I mounted my lens as seen here in this reference pic. Not entirely sure of its accurate but l use the same technique in all my buckets and it works excellent.
Long story short center your lens material, firmly pres against the ear screws leaving a dimple in the material. Drill the dimpled area with the same screw size, in my case 3/16". Install lens.
I'm still looking for a good solution for the lens. Kind of hesitant to chop the lens up and glue it to the eyes. I was thinking of following your instructions by drilling two holes into each side of the visor. However, I would use the existing Anovos screws that are already in the helmet. Would this work? What size drill bit should I use?
I'm also curious about using these for padding the helmet. Any other suggestions?
https://www.amazon.com/Myheartgoon-Tactical-Airsoft-Helmet-Accessories/dp/B016GTU3PK/ref=sr_1_4?ie=UTF8&qid=1467094450&sr=8-4&keywords=helmet+pads