At the moment I'm actually working on an A2000 tower. I started it a month ago.
The motherboard is huge! You will at least need a tower with 5 5.25 bays, and then only one of them will be usable. I havent decided what tower to get yet since I'm in no hurry to finish this project. I would really really like to get a Lian Li with a front door even though no 5.25 bays could probably be used then

But the thought of cutting up a 200 dollar case is frightening.
Anyways if you want to take a look I made a small site about it, but in the future it wont be updated since I'm putting it in my main site.
http://spotnick.servebeer.com/~cv/a2000t/