sorry no photos...
here is what i did:
i brought 2cm x 2cm pine timber strips, which i used to assemble 6 1x1 metre frames the a cross peice thru the middle.
then i went to my local foam and rubber supplier (clark Rubber here in Australia) and got them to cut me 6 1x1metre sheets of neoprene rubber sheet 1cm thick (the stuff wetsuits are made of), 6 1x1metre blocks of closed cell foam 2 cms thick, and 6 1x1metre sheets of acoustic egg-crate style foam.
i glued using epoxy resin, the wooden frames to the closed cell foam blocks then around the inside edges of the wooden frame i sealed with silcone caulk to prevent and air escaping between the 2
then i glued using copious amounts of epoxy the neoprene rubber to the otherside of the wooden frame (this time sealing with silcone around the outside edges ensuring no air could escape anywhere
i spot glued the acoustic foam over the neoprene.
i use and move these around to block sound and reflections where ever i need them... particularly good around the drumkit...
and the dead air space in the middle particularly blocks all of the sound from passing thru them
