I think lads need to calm down a bit on social media re. Greenfields site. Having expanded our similarly exposed farm with topless cubicles and calf shelters here the last few years, I would be in the unique position of having both cubicle sheds and a calf shed also. The wind blew in from the North and straight up through our cubicle shed gathering all the powdery snow off the fields and dumping it on to the beds, the cows were frozen in it, a shed needs to have the North side open by right, the outdoor cubicle beds were sheltered by a wall, albeit cold the beds weren't covered in snow, unlike the shed. The calf house was a nightmare, the wind blew the snow in over head and carried the snow in to make a fine mess of the straw beds, wheras we shut the calves in to the shelters for 36 hrs only letting them out to feed, these calves were snug and dry. However, saving money on a concrete wall in a parlour is madness in my opinion, a lorry load of concrete wouldn't be far off of completing the walls in a parlour. Also, letting cows calve outdoors is not a good idea in my books, any rain/wind/snow/frost and the calf is going to be against the odds. A small (relatively) , well sheltered shed for calving wouldn't break the bank either.
Over the years we have lost animals due to pneumonia in sheds, we haven't had any, not even one health issue with the cows in topless cubicles.