I use biots on my hellgramites. This is what I have been using.

Hook: 6x long, size 2 to 10
Thread: Olive 8/0
Dubbing: Dk. Olive, Dk. Brown, Black. 90% natural 10% syn. blend
Wingcase (overbody): Tyvek, colored with waterproof markers
Legs, Tail, Pinchers: Dk. Olive biots
Underbody: Lead, 2 pcs. tied flat on hook shank
Eyes: 2 small beads. Held by mono