Unless someone can find info I can't, it looks like you're going to have to physically measure with a measuring tape how much room you have in that case. Even the official Rosewill page for that case don't give information on max graphics card length that will fit.
It will also depend on which 1080 you buy, as they all very in size depending on the company that makes it.
Wish I could be more helpful, but you're going to need to measure with a measuring tape I think.