Circular Fan Duct with Holder for Angel Eyes

It was an idea from "Hardwarekiller".
He asked me to design a fan duct for a 50x50 cooling fan and with the possibility to mount an angel eye on it. To get an idea how about this could look like we found this fan duct: http://www.thingiverse.com/thing:17035
I never had experience on printed parts before. So I had to learn a lot till I found a design that meets his wishes and is printable as well. And this is what came out and of course it is printable without support. We have printed it fo