I made one two weeks ago, I used an old mesh sun viser out of a tractor, but I am sure any sun visor mesh will do.
I cut it to the shape of the inner side of the roll bar ,I then outlined the mess sewing webbing around the edge, at present I have held it on with cable tyes but I have made some enquiries about some small nylon straps with plastic clips, and then I intend to sew them to the webbing on the edge. I have also thought about using the poppers on top of the boot cover were the tonneau pops on.
The draft excluder itself does work. Give it a go. Kingsley