Its really hard for me to estimate price right now, as I'm still thinking how to bundle it (1 pcie riser, 2 pcie risers, sli cables etc ...)
The hole in the back of the case would stay there. It is hardly visible as it is the diameter of a hdmi cable and its directly under the power supply.
If you wanted to you could use a 120, AIO for the CPU but on the bottom front only, because the hoses have no way of being routed in the top slot.
I'm thinking the front panel will probably be redesigned before final release anyway.
Sorry if this comes off as disrespectful, like you haven't brooded over this before, only trying to give my feedback. I like your case, I think you're doing a pretty good job.