Well this ended up being a huge success, although it was an expensive operation. The raspberries definitely dominated both the flavour and the aroma of this beer. It was highly regarded by glutenous brewers and they actually convinced me it was good (I wasn't originally sold on it). The calcium carbonate definitely helped to keep the acidity down from the raspberries, otherwise it may not have been drinkable.
So to recap:
Very easy drinking
Strong Raspberry flavour and aroma
The beer is very tart like natuaral raspberries
Photo of the beer as taken by my wife: