More links to patterns for the RAB dry fly.
http://www.tomsutcliffe.co.za/fly-tying/105-new-dry-fly-the-halo-hackle-rab-variant This link gives step by step tying instructions with photos.
RAB footprint on the water. Photo www.tomsutcliffe.co.za
An original RAB. Photo www.tomsutcliffe.co.za
The following link gives detailed tying instructions and photos of the RAB in the photo above. http://www.tomsutcliffe.co.za/fly-tying/74-tying-a-high-water-rab