It can be done but it's a bit complex. Ideally you need to be able to work out the centre of the circle from which the arc would be made. You can also do it by trial and error:
Draw the block underneath the arced roof
Draw a construction line up from the centre of the gable end to the top of the roof.
Draw a continuation of this line downwards, well below ground level
Draw Block: Outline - Shape: Circle
Select a centre point down the construction line and then your outer radius to one of the top gable corners: check the circle goes through the top point marked with the construction line then click at one of the rear top corners to make the cylinder the correct length
Cut this 'block with plane'
Convert to Building Block
You'll probably then need to place a hole in the ceiling and merge
_________________ Andrew Bairstow
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