If your planning on clocking then you want the best airflow you can get in there
so if it was my case I'd
one 120mm fan front intake
one 120mm fan side intake (optional)
two 120mm fans in the roof >exhaust
one 120mm fan at rear >exhaust
maybe look at one 120mm in the floor in front of where the hdd cage is now but I would rotate hard drive case 90' or remove altogether, its blocking your 120 front fan.
Good luck with the unlocking man, hope it goes well for you