perhaps there can be a bit more on fenders.
while they will protect drive train parts to a certain degree and mainly keep the rider dry, they will cause excessive build up at the fork crown and stays.
tucking in the rear part of the fender as close as possible to the tire while leaving plenty of room for the rest of it will help reduce build up there. Also, when the snow is the sticky kind, if the fenders sit too closely to the tire, they can cause snow to get packed up inside the fender and turn into slabs of ice which will slow you down, as they'll cause a lot of drag on the tire.
I had to stop a few times to kick out the slabs of ice by hitting the fenders and spinning the wheel backwards on a day with fresh sticky snow. I would say a good rule of thumb is being able to see the other side through the fender and tire.
feel free to take any pictures from here.
Another thing you might want to add, are things you can retrofit or bike so that the winter is not as tolling on the parts.
I would say the motto for that is: "If it's good for mud, it's good for snow."
mud guards for fenders (particularly the front) and lizard skin headset seal. The mud guard, if it extends all the way to the floor, will keep the spray, that the fender doesn't catch from collecting on the crankset and chain. The headset seal, will keep the bottom race, which is the important part, from collecting the spray from the front of the fender and ruining the bearings and races through contamination.
spray from the front of the fender:
not a good build up of snow
severely bad build up of snow