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these DIY project is... WOOOHOOO! Looks absolutely professional for a fraction of cost of a ACM product (sorry, Michel
. But one thing that keeps in my mind is the problem with the fibres of the mineral / glass wool. These fibres can break after a certain time period and get into the air. I think that wrapping the mineral wool pack into cellophane foil (you know, that foil you wrap your bread and butter stuff in) would keep the fibers inside. Additionally this foil is kinda self sealing when two layers of foil get contact.
It is a very (!) thin foil so it won't cause much reflections.
Does anybody have some frames in just-before-ready-status and could give it a try with that foil? I'm curious if the fabric keeps the form when the cellophane is between.