Tarantula Z-Brace for 8mm threaded rod

A remix of teikjoon's fantastic threaded-rod z-brace (https://www.thingiverse.com/thing:2744093) which adds frame brackets for the upper pieces. This moves the bracing point higher up the frame, provides a larger attachment surface, and eliminates the need for separate corner braces. Lower piece is unchanged.

Works with 8mm or 5/16" threaded rod. 43cm per side. I've used 8 standard M8 nuts.