Hi Marco. Great construction. On my second attempt I did in fact use a 51.43 degree rotation & it worked perfectly which must be down to creating a more accurate first shape for the multiple rotations. I needed no 'patches' in this drawing.

Originally I thought I'd need to create the three seperate 'bevel' effects but was quite pleased to see using a proper bevel worked fine and therefore only required one linear fill adjustment not three per shape.