Found this neat vid
Not a fan of needle body construction any more but the liked the results; easy enough to translate it to Carnage style. Tied here as a hydropsyche; change color/size to suit your needs.
hook ? Dai Riki 135 #16
thread - MFC 8/0 sand
core - 10 lb mono
egg sac - Uni-stretch green
abdomen - bleached peacock herl
shellback - 1mm foam tan
wing - Congo Hair shiner tan
hackle - barred cream
head - 1mm foam tan
Part 1
put a loop in the end of the mono
mash barb, start thread; brush on a little Super Glue and tie in mono
hook the loop onto the gallows, tie in foam strip and Uni-stretch; wrap up the core (shank length)
wrap sac, tie off/trim
tie in peacock; wrap up to sac and back, tie off/trim