We are presently building two rooms one Tracking - one Control and we got given a number of large sheets of particle board 13mm (1/2") thick. My question is, what would be the effect of using this material to replace the first of two layers of 13mm Drywall on the internal walls, i.e.; the layer screwed directly to the resilient channel. The other "donation" we have received are a couple of external doors, very solid, only problem they both have an very solid (bevelled) 3/8" thick glass panels. I would like to use them, one for each rooms, but I am wondering what would be the best material to use between the glass and/or if I should use any Plywood or MDF panels screwed and glued to the timber around the glass? thanks for any opinions / suggestions on this!