If you have a recommendation for keeping subparts of a wall of sloping height in line with the original I would be very interested.
I had assumed I would just have to work it out once the design is more stable but if there is a neat way of keeping them all in line it would be good to hear.
I now have a proper roof ( well a rhomboid ) but currently I have to drop it down by an extra few centimeter to deal with the cracks - probably not very professional of me.