You don't need a certain size res for any system, you can run one without a res. Filling will be harder and if you don't have an air trap then bubbles may be a problem too.
I don't think you are going to be able to run your system without fans. Those rads don't convection cool even when placed optimally, and if you have them inside your case then they pretty much wont get cooled at all.
Can all those components fit in there? I don't have the bits to move around to see if they will fit but from what I have heard it'll be tight. If they can though I might be doing the same.
Edward
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