Google yields this result:
Company Profile - Guilford of Maine (Canada) Inc
Not sure if this is legit or not as I have not contacted them myself. But I am looking for some good acoustically transparent fabrics to cover some DIY 703 panels myself and a buddy have just made. (We have taken a lot of video as well and will be posting on my website soon, I will be sure to post back as soon as we get that edited and uploaded).
Let me know if you find anything good.
MR