I finally got around to it... I´m making half a dozen broadband absorbers.
Here´s how:
First its the frame,
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Thats what holds it together (+ glue on the ends of the wood)
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Place it on the floor
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placed white fabric over the frame (thats gonna be the back of the panel)
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then the put the pressed rockwool (75mm thickness) over and press it in, then cut the fabric,
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then lay out the fabric for the front of the panel, turn the panel over and place it on there,
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then some stapling,
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then more stapling, followed by some more cutting of the fabric,
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then its finished (front view)
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back view,
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then screw in the chain to hang it up,
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up it went,
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thats it... only five more to go!
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Enjoy!