hi,
the making of:)
1) extrude 1 rectangle and draw 2 rectangles on surface
2) select the box and do substract boolean with the blue
3) 4 lines to join vertex and mirror them with cyan line
4) 4 lines to join vertex and mirror them with orange line
5) select all lines (16) and do mutual trim with solid
6) select 4 magenta face
7) extrude these (in one operation) with tapered (angle = 20) and flip options
8) subdivise (slider at 67)
9) rotation copy

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