Welcome fredmix.
It's great to see a fellow engineer.
I am looking to build and/or buy some good treatment implements as well.
As far as fabrick that will hold back the nasty fiber particles, I'll check exactly what my "Do-it-Yourself" home studio design book suggests.
I also run a recording studio and face many of the problems you must be facing.
I'd love to have you join in and start some discussion at the
Audio Production and
Editing Software forums.
Do you mix fully in-the-box or do you have a console?