Tervigon - planning the beast

Since my friend borrowed my 4th Edition Tyranid army for the Carinthian Championships last weekend and placed 2nd overall and I have my ongoing project (almost) finished, I decided that it was time to convert the army to 5th edition.

Starting with the Tervigons. I have five Carnifexes in my army- three of them equipped with (back then) twinlinked devourers. What I already did was rip off the arms so that they could be played in the torunament. What follows will be to bulk them up so that they fit the artwork. I will try to reproduce the image from the codex to a certain degree but will also give them my slight twist.

An inspiration is (as always) mother nature with this gross bug (Abedus):