That's one nice futuristic level JakeL !!
The level in general looks very attractive to walk in, and observe from
The textures really fit together, the level geometrie looks pro !!
Like Damocles said, add some more dirt maps, bumpmapping to improve the textures to get the top quality out of them
Could you tell me which skin size you mostly used, because I noticed the skin quality is good so I guess you mostly used a 512X512 and 1024x1024 skin size and the demo is running very smooth !! I'm just abit curious, no more
Btw, nice site your got there ^^

Cheers

Frazzle