Ofthen you can just fit SATA power cable and connector to the plugs in the HDD bay on the laptop and have the actual HDD sit on the side.
Obviusly its not going to look all that awesome, with the HDD duct taped to the exterior, but if you get cooling problems along ith the new graphics card, your probably looking for an external cooler anyways, and those sometimes have a little room for a HDD somewhere.
Why your gaming on a laptop that your steadily crippeling into a desktop. Well ill leave that to you.