no but Roger Crisler is a very good luthier off of 35E and old denton... im sure he has a couple people he could refer you too.
Very approachable and a really cool down to earth guy ... give him a call he's alway's taken time to help me out.
Crislerguitar.com
and making a frame and stapling the cloth is probably eaiser than you think ... add some velcro for easy removal ... heck ... after looking at the grill on my little acoustic b20 ... you can easily pull this off yourself.
um... i would like to see your cab in action ... and play thru it ...
I still have my eye on a fearful 12/6 ... my gig cash is being saved ... just a few more.