1) I mean worse than other motherboards, so it won't be very loud and sound kind of hollow.
2) It won't. Silverstone themselves suggest using those. Quad-core doesn't mean much of anything as most games only use 1-2 cores due to aging engine coding. Frequency is king of everything. You *will* overclock.
3) Good catch! I had never noticed that before!
4) Its not an issue of how they fit, its an issue of orientation and thermodynamics. Heat rises, and the longest part of the heatpipes is vertically below where the GPU is. Non-reference cards in any 90 degree orientation Silverstone case is a no-no (FT02, RV02/03, etc).
If you want less restrictions with a better case in every regard, get the Bitfenix Prodigy. The thing is tiny and weighs very little. You can stick just about any cooler in it, and even use cards as big as the GTX690. I've been playing around with one for the past two weeks working on my own ITX build and I'm absolutely smitten with it. There are so many amazing features on it, especially for the price.
Watch this review on it. I can honestly say that in many ways I'm more impressed with it than some $200-$300 cases I've used.
With the handles, it'll be easier to move around than the FT03 mini.