I really don`t know what kind of imitations this is, or if it is a imitation at all. Got a picture from one customer who used this kind of patterns after sea-trouts in the west coast rivers in Norway. The fly is big, and very diluted with lead.
Hook : Mustad C49s #6
Thread : Semperfli Classic Waxed Thread 8/0, Black
Weight / Head : Brassbead, Gold and Lead
Tail : Pheasant Tail, Brown
Body Back : Fox Dubbing, Red
Body Forward : Sasquatch Dubbing, Dark Grey
Ribbing : Silver wire
Collar : Hungarian Partridge, Natural
Legs : Rubber legs, Black
Thorax : Sasquatch Dubbing, Dark Grey
I start wrapping the lead on this fly. I use lead all the way, but the heaviest part is around thorax. Then I use some superglue to secure it all.