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// main body arcs definitions
Arc a1 = new Arc(Plane.XY, new Point3D(-20, -15), new Point3D(-22, 0), new Point3D(-20, 15), true);
Arc a2 = new Arc(Plane.XY, new Point3D(-20, 15), new Point3D(0, 16.5), new Point3D(20, 15), true);
Arc a3 = new Arc(Plane.XY, new Point3D(20, 15), new Point3D(22, 0), new Point3D(20, -15), true);    
Arc a4 = new Arc(Plane.XY, new Point3D(20, -15), new Point3D(0, -16.5), new Point3D(-20, -15), true);

double filletRadius = 8;
Curve.Fillet(a1, a2, filletRadius, false, false, true, true, out Arc f1);
Curve.Fillet(a2, a3, filletRadius, false, false, true, true, out Arc f2);
Curve.Fillet(a3, a4, filletRadius, false, false, true, true, out Arc f3);
Curve.Fillet(a4, a1, filletRadius, false, false, true, true, out Arc f4);

// outer contour
CompositeCurve cc = new CompositeCurve(a1, f1, a2, f2, a3, f3, a4, f4);

// body extrusion
devDept.Eyeshot.Entities.Region bodyRegion = new devDept.Eyeshot.Entities.Region(cc, Plane.XY, false);
Brep body = bodyRegion.ExtrudeAsBrep(7);
design1.Entities.Add(body, Color.Red);

// creation of revolving region to perform upper face rounding
var bodyFinalHeight = 6;
var radius = 200;
Arc a = new Arc(Plane.XZ, new Point2D(0, -radius), radius+bodyFinalHeight, Utility.DegToRad(70), Utility.DegToRad(90));

CompositeCurve cr = new CompositeCurve(
    new Line(Plane.XZ, new Point3D(0, a.EndPoint.Z), new Point3D(0, 20)),
    new Line(Plane.XZ, new Point3D(0, 20), new Point3D(a.StartPoint.X, 20)),
    new Line(Plane.XZ, new Point3D(a.StartPoint.X, 20), new Point3D(a.StartPoint.X, a.StartPoint.Z)),
    a
);

devDept.Eyeshot.Entities.Region roundingRegion = new devDept.Eyeshot.Entities.Region(cr, Plane.XZ);
Brep bodyRounding = roundingRegion.RevolveAsBrep(Utility.DegToRad(0), Utility.DegToRad(360),Vector3D.AxisZ, Point3D.Origin);
body.RevolveRemove(roundingRegion, Utility.TWO_PI, Vector3D.AxisZ, Point3D.Origin);

// triangle extrusion
LinearPath triangle = new LinearPath(Plane.XY,
    new Point3D(-5.25, 5),
    new Point3D(5.25, 0),
    new Point3D(-5.25, -5),
    new Point3D(-5.25, 5)
);
triangle.Translate(1, 0, 3);

devDept.Eyeshot.Entities.Region triangleRegion = new devDept.Eyeshot.Entities.Region(triangle, Plane.XY);
body.ExtrudeRemove(triangleRegion, 10);

// change triangle faces color
body.Faces[10].Color = Color.White;
body.Faces[11].Color = Color.White;
body.Faces[12].Color = Color.White;
body.Faces[13].Color = Color.White;

// fillet body edge
body.Fillet(13, 0.8);

design1.Entities.Regen();