Just done my first wire spider and rather impressed with it's stability. It's a simplified version of Rolfs (Skyviking). My secondary is a lot lighter than your 1/2 kg prediction and I'm only using .23mm top 'E' guitar strings but nothing to stop you moving up a string or two in diameter to gain some strength with the heavier holder. Although I must add here that having all the adjustments away from the holder simplifies and lightens that considerably as well.
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