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Old 10th January 2018
Gear Guru
Size Matters

I wouldn't risk building a smaller design. I would assume that the commercial designs and the original inventors made the best choice.
It has been hard to get hold of Isobond, but Don has fixed that CARUSO-ISO-BOND 100mm WLG035 Absorber panel 1560mm x 1090mm, 112,95 &

I nearly went ahead with some of this, may do sometime. Regarding steel I intended getting it professional painted or powder coated. I would imagine galvanised would be a practical cheap option also. Note there are variations with 75mm Fibre, 1mm Steel, 25mm fibre.