Hi there,
I haven't seen doom9.nl but babaz is right: You need not change much in Doom9's site design (in fact, you shall not if you want it to be official...). The best "advertisement" for you site is the small 20*10 Pixel flag in Doom9's Top Frame! Without it, the translations wouldn't be as successful as they are.
(Doom9.de has >6000 visitors each day, most of them come from Doom9.org/top.hmtl
And... good luck! This project takes a lot of time and work.
One hint for you: You need not start a new thread for each and every message concerning your project here in the translation forum...