Looks good mate.

What are the yellow heatsink fin's that wrap arounf the side there on the botton of the render?
Are they just there for looks and made out of yellow perspex?

I think some, say 6mm perspex would be excellent to use as a mounting bracket under the pump, either clear or even yellow would look good too.
Or you could just use some aluminium thats been pressed up to sit the pump on, now having a small amount of highly polished, mirror like finish on it would also look sweet.
Add just a bit of bling to the inside, hay.
But I don't like the idea of having the pump look like it's just hanging. That to me would really give me the feeling that it is unstable and not quite finished.

Let us know what you come up with mate, really all come together now.