I have measured inside my CM Storm Scout now. And depending on where the cooler from the card will hit I will have clearance, I think..
The corners of the plastic shroud are rounded, this is probably what's going to save me.
Where the red arrow is (Below that, in the harddrive cage itself is a little bit more space. Maybe one mm. extra), I meassured around 27.3cm from the front PCI-slots (Card is said to be 27.178cm according to ASUS). Where I have circled in red are the point sticking out the most. Probably around 27.1 or 27.2cm from the front. Here is where the card elevates from the bottom and have corners on the plastic shrouding. So I think it will fit, but it's going to be tight. I've ordered two of these cards now. Crossing my fingers.
BTW: Two of these cards will look awesome in the CM Storm Scout. And they will have a 120mm fan in the sidedoor blowing straight on the cards. If they fit, it will be just perfect.. Not matter what, the plastic shrouding on the cards are the longest, and it looks a little flexible. So I'm sure this will work out just fine.