Okay I got a couple questions:
Is modding your case shell out of the question like adding holes for a fan and do you have tools to perform this task if yes is your answer?
Are you really just waiting for the newer GPU's so it can be replaced or is this quest really for a permanent fix? The reason I ask is if you are changing the GPU's you might want to wait before modding the case to see how your GPU performs and fits.
I will give you an example, in one of my NAS builds I...