Sorry for the long post, but Nvidia brags about the Titan fitting in SSF computers and even shows the FT03-mini twice. I happen to own a FT03-mini, but I have no idea how you'd fit a Titan inside.
If we first compare 680 and the reference 7870.
The plastic shroud sticks out a little bit further in an arc, but the 680 is still longer. Both fit in an FT03-mini, but it's a squeeze with both. I litherally had to squeeze my 7870 to get it in.
It's about 1.5cm from the floor to the top of that metal plate where the USB drive is standing so that's all you'd get if you cut out that metal plate. The 7870 is 9.7 inches (244cm), 680 10 inches according to Nvidia and for comparison the USBthingy is just over 1cm. How the hell does a 10.5 inch (267cm) Titan fit? You'd seriously have to mod the case. I meassured the height from the bottom to the top being just under 10.5 inches (ironic

) and there is a clip sticking up from the fan filter you'd have to get rid of not to mention the fact that the Titan exausts some of the air the other way over what I believe is the VRM. You could do something about the floor, but that's where the only system fan is. Unless Siverstone has revised the chassis I have to see a Titan inside to believe it.
On the bright side it's probably running at a constant 95C ^^
I'd love to see that Boost 2.0 in other cards. Would be awesome just dialing it never go above 85C and 50% fan speed instead of fighting against a stock fan curve which wants to run a reference card at 60ishC at load...