Based on the Fibonacci sequence - three main radii based on a ratio of 13 / 8 / 5 where the largest was 3400mm external as that fitted the end of the garden. Gave me the right working areas, looked good from the house and fitted in well in an area riddled with oast houses
Because we are in an 'Area of Outstanding Natural Beauty' and had to swing the design past the local panning department and neighbours, used a brick and slate construction. Reclaimed elm floor 'cos it looks fantastic, cavity wall with oodles of insulation in the floor, roof and walls as I want to be comfortable there. Brick was also an ideal material for coping with the different curves.