ULA Attachment Bracket Version 4

Hi all this is my fourth solution to the challenge. I've attached the file in IGES, STEP and STL. Mass = 0.071822lb (32.577911198g) Max Stress = 2896.603psi (at a very micro place) Min Factor of safety (no weak point) = 3.004 Max Factor of safety = 542.837 Force applied = 600lbf, 1000lbf and 1500lbf (Please see the picture attached). The attachment bracket can still survive when 1500lbf force is applied in negative z direction. Thank you very much for your viewing and download, and for the thumb ups, if any.