That captures the essence of the Tyranids perfectly: Ravenous monsters, That would make the Xenomorph Queen shit bricks. And don't get me started on how beautiful the textures and lightning are. Outstanding work!
Just watched Aliens last night and this totally reminds me of the scene towards the end when Hicks lifts the grate in the ceiling and sees the wave of xenomorphs crawling along the ducts! I pity any of the poor souls trapped in the installation with your tyranids. I'd say they're all doomed.