Making a Tyrannofex

[rimescales]

Hello all. I'm new(ish) to the site and I was hoping to get some friendly advice.
I'm considering making a Tyrannofex with Rupture Cannon (and with success, maybe one or two more with Fleshborer Hives) for my 'Nids army since its such a good long range vehicle wreaker (second only to a good old fashioned warp blast to the hull).
I have no idea what dimentions/sizes I need to make my 'Fex. I know it needs to be bigger than a Screamer-Killer and near apar with the Tryant in height.
Also, I'm clueless as to what a bog-standard Rupture Cannon looks like, but I was thinking something with alot of teeth around the barrel.
What materials do you most recommend (and why if its no bother)? And if you've made one, how?

Any advise or critic is very much welcome. Thanks to all who answer.

[Threeshades]

This is my T-Fex

I made his rupture cannon from two stranglethorn cannon, a venom cannon, a heavy venom cannon, a venomthrope torso, some green stuff and a few trygon spines.

[rimescales]

*Blinks* Dang...!! *Blinks again* Now that's a weapon!
Thanks. This'll make for good inspiration. I forgot to mention this before. But I'll be posting any progress I make here.

[rimescales]

I'm experimenting by making a Prime, before I make the T-fex.
And interesting result is mixing White Tac with Super Glue. The outer surface of the Tac hardens like plastic (while the centre remains soft, so its very possible to remove any botched work). Be careful though, as this will produce a strong smell for a few brief moments. Hold away from your face when you apply the glue.

[alexg]

Here is my t-fex WIP, you can see how large it is compared to the CSM,
its also much wider than a normal fex

[Frontier Guide]

Biomega made a great tyranno ages back, just message him.