GL.iNet GL-AR300M16-EXT mounting bracket

A remix of tinelli94's really great GL.iNET GL-MT300N-V2 bracket -- fixed a few consistency problems which weakened the structure. I printed the original in solid PLA and one of the legs snapped with very light finger pressure. Ran it through an STL repair app, which found 4 naked edges, 1 planar hole, it also doubled the vertex and triangle counts. My best guess is that the model was never solidified prior to export?? At any rate, it's a good overall design -- this revised print is visually identical, but much stronger.