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Thanks Cerbera your technique has worked! Genius, thank you for your help. I used your technique of drawing the square in the orthographic top view and then joined them to the outer polygons. Then I did the smaller inner extrude. Then I extruded the square shape up and flattened out the top. This top shape was made slightly thinner on the x axis to taper the shape (this caused the sides of the tabs to become non-planer but it is under 2º so I set my Planarity Threshold to 5º). I also rearranged the points on the top of the tabs to match the desired slot shape and also