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That may or may not be an issue with any vent without big overhangs, but impossible to know until you get through a few rainstorms with vents installed and open.

Yeah really hard to tell with a photo unfortunately - they could be bigger than I think, or smaller than you're hoping for. Probably need to play it by ear and be ready to make changes as needed once you actually have the unit.

So you'd need to get a ladder and measuring tape to get the exact numbers, but my guess is just the existing vents aren't enough. How many birds do you plan on having in total? I don't count any doors into ventilation as they will be closed at night.

Aim for at least 1 sq ft of ventilation per bird. The existing vents (assume it's those circles?) is probably under 2 sq ft total. Winter cold is less issue than summer heat. Healthy adult chickens can endure some pretty extreme temperatures, well below freezing, as long as they have a dry...