Actually i just checked frys's website they cost 6 bucks to get 2 1foot cathodes! :O Cool case lighting here I come! Btw you can get some of these for like 5-8 bucks off of amazon, look at the logysis ones!
I am pretty sure you can add some cathodes, because you kind of have that side vent thing. But for me I have a haf 912 which has no side panels but has a huge vent on the top