Cool!
Still got the rockwool lying round to build mine. Or should I say overbuild? If somethings worth doing, its worth overdoing.
Need the birch ply, speaker, goosenecks, XLR connectors and a spare weekend. And to not be such a lazy git!
Neoprene is a good thing to add to the list. It's used in flooring for gyms.
25mm MDF works as well as birch ply if you are going for a box in a box solution