This is a Cage in stainless steel i conceived using open source software Blender.
The model was preliminarily built in Paper (using Papekura) and then it was hand craft with stainless steel 4mm diameters rod. Is soldered using TIG: thank for the grat job @ Roberto.
Is light weight, around 1,4 Kg, and it easy for the Singer to hold on is back without hindrances for the voice & breathing.