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So, I've been looking to purchase and add a Firestorm Redoubt to my army for some time.

Problem is, it looks far too space-marine-ish to my liking. I'd like to add elements of Tyranids to the model.

I always see Tyranid tentacles / towers all over the internet, I have no idea where I could purchase something like that.

Also, I was thinking of making / adding some sort of webbing to cover the walls of the terrain... to at least make it look like a cult of genestealers used it for their brood / Venomthropes released spores there.

Any help / ideas would be appreciated.

well you can always use the imagination you'd be surprised at how well stuff turns even if you don't have the best skills(i.e. me)but I believe that armorcast makes some alien terrain just try searching google images and the web they'll pop up that's what I usually do a lot of times I find good sites I might of never found before too but best of luck maybe someone else could be of more help,

Here's how I build mine.
http://www.dakkadakka.com/dakkaforum/posts/list/0/259451.page
I can probably point you towards some better pics of my infested imperial stuff if this is the sort of thing you're after?