Ceaser - you are incredibly brave - total respect to you!!
I took a trip up in late November and was lucky with some amazing weather. Rode it twice in the day, the last time to get the sunset at the top, which was the highlight of my year on the bike
The Llenberis track at night is what lights are designed for - and no hikers to worry about!
The Rangers is mental, but brilliant!!
I would recommend a Very early start or a late start, as negotiating hikers at warp speed whilst trying to be polite can be a pain
Would recommend the Don Perris guest house - run by a sound biker called Simon who is a wealth of knowledge

Snowdon Sunset by boltonjon, on Flickr