Here is my process for my room treatment panels
I made these frames from 1x2 fir and made small corner braces to hold the Roxul in place.
Next I laid the fabric face down on the kitchen table so it was square and flat
I then laid the frame on the fabric and centered it.
I folded the fabric around the frame on one side and used thumbtacks on the inside of the frame.
Once the fabric is stretched and tacked in I lay the roxul into the frame which is a tight friction fit
The finished product
And hanging on the wall.
Not sure if there too gay or not I will wait and get Bobs seal of approval