Taking a jaundiced view; the Krystal Flash is optional but adds a nice bit of sparkle.

hook - Dai Riki 075 #8
thread - Danville 6/0 yellow
tail - yarn fluoro yellow
rib - small wire gold
body - dubbing yellow
body hackle - dyed sunburst (1 Tbs Rit Golden Yellow/1 cup water)
underwing - Krystal Flash yellow
shoulder hackle - golden pheasant yellow rump