GPU airlfow is the other way. GPU draws air in through it's fans, through cooler, against PCB and out in case. This means using the bottom as intake to supply air to the GPU.
Not all case vents need to have fans in them.
So bottom and front intake with everything else exhaust. Remove unused PCIe slot socket covers to allow airflow past GPU and out the back.
I'm kinda busy right now. The key is to try different combinations and see what works best.