Glad it is of help to you guys.
Frak, I'm unsure of the costs, but I think I used about $20-$25 worth of timber, fabric, nails & staples for each panel. I bought 3 sheets of 2400x1200x50mm Acoustisorb 3 for about $140. So far I've made 5 panels (2 were 600x600x100mm, 3 were 900x600x100mm) and...