This is my version of this fly, there are so many variations you can do with this.
Hook: Daiichi 1130 #10
Underbody: tungsten thread weighted to an 1/8" tungsten bead/ smooth body with tying thread
Abdomen: Uni yarn- olive/chartreuse ( woven ) ( I also use DMC floss )
Thorax: Flash nymph dubbing- yellow ( honestly it's olive )
Thorax back: Thin skin- fly specks olive/black
Rib: copper wire
Some color variations