Very nice build!
I pretty much did the same thing, although i used the norco 5 in 3's and am running windows 2k8r2
I spent a lot of time deciding on the OS, because i have always wanted to play with raid, I ended up going down the windows route and used a areca 1880ix-24-4gb raid controller.
The way i got rid of the tabs was to get a hacksaw and cut them out. As you can see below
For drives I am using Hitachi 4TB Coolspins, have 6 in there ATM.
To mount the SSD i got some strong velcro with adhesive backing and stuck it to the back of the motherboard tray
Here are some more pics of the beast. I went a little over the top and added water cooling.