The arm should be able to rotate using the nail as the axis.
Hold a pencil at the end of the rotatable arm to mark the curve.
Do this to both ends of both beams and one end of each rafter.

Cut the curves

Cut the curves.
If you do not have a band saw, then you can use a miter saw to cut the curve by making a number of straight cuts at different angles around the curved line (see fig.1). The rounding off process is then completed with sandpaper and a sanding block.
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