-
I'll be interested to see how that works - my first version was just a perforated rim which was successful in arranging uniform hand stitching in 3D, but I struggled with fabric tension - the ends became Pringle shaped, with additional wrinkles.
The second version (in the sewing thread) has a filled centre which gives a convenient surface for contact adhesive to hold the fabric flat while everything is pulled tight.
I did contemplate a central captive nut to fit a light mount - perhaps in the next version...
And shamelessly copied from @MrE in the sewing thread, a bar bag end cap.