Update! Excellent News!

Well Ladies & Gentlemen,
good news: I will soon have all the models I need for my army (bought. Not built/painted)

I just found a video about someone's Tervigon - he used a Malanthrope body and head and a carnifex lower body and legs - perfect if you ask me. Looks brilliant. I might exchange the head with the Carnifex's one though.
So as soon as I can I will order the Malanthropes and get the last few Termagants. The only thing missing is the spore, but I guess I'll just get one of those dragon toys like seemingly  everyone else does.
I also decided on a colour scheme: White undercoat, Adeptus Battlegrey foundation, black shadowing, red "insides", silver horns/teeth and metallic green (1:1 dark angels green and boltgun metal) carapace. Anything tube-like will blue. I will post the first painted models as soon as they're done.

In case you haven't seen the list. While I might give it some small tweaks and changes in weapons, nothing much should change until I played a good few games with it.

HQ: Tyranid Prime
-Lash Whip & Bonesword
-Deathspitter (or Adrenal Glands)
-Toxin Sacs
-Regeneration

HQ: Tyranid Prime
-Lash Whip & Bonesword
-Deathspitter (or Adrenal Glands)
-Toxin Sacs
-Regeneration

Elite: 3 Venomthropes

Elite: Deathleaper

Elite: 3 Zoanthropes
-Mycetic Spore
-Twin linked Deathspitter

Troops: 15 Termagants
-Devourers
-Mycetic Spore
-Twin linked Deathspitter

Troops: 13 Termagants

Troops: Tervigon
-Toxin Sacs
-Catalyst

Troops: Tervigon
-Adrenal Glands
-Catalyst

Troops: 11 Genestealers
-Toxin Sacs

Heavy Support: Carnifex
-Frag Spines
-Adrenal Glands
-Regeneration

Heavy Support: Carnifex
-Frag Spines
-Adrenal Glands
-Regeneration