/ Bothy Lochnagar area?
If I remember rightly, it is more like an open bus shelter!
What OMR and ScraggyGoat said plus there is a covered area at Allt-na-Guibhsaich which offers a open but dry sleeping area not far from the car park at Glen Muick.
And given the snow cover at the moment you'll be able to snowhole within 1 km of all the bothy options mentioned already.
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