Cheers for the good reviews guys (and gals)! Coir is some kind of natural fibre. It kinda looks like fine strips of wood fibre or something like that, i think rubberised horsehair can be used as a subtitute but I have not been able to get hold of any. Try looking in a fabric/arts and crafts store. Foamcard is like the insulation foam you decribe, jay, but it is sandwiched between card. The stuff used in the article is about 8mm thick. I may add some more piccies for reference