Conny,
This is fantastic, and something the acoustic DIY community can benefit from in a big way.
There is s BRAND NEW Acoustics forum just about to go live that is non-commercial and is dedicated entirely to idea and application of DIY ACOUSTIC TREATMENTS..
Would you be interested in sharing your project at this new forum?
Please PM me, or email me through the website.
Your contribution would be enormous and greatlt, greatly appreciated.
Cheers,
Joel DuBay
www.readyacoustics.com