the case arrived yesterday. then i completed the setup last night (actually at midnight hehe). sad the package didn't contain any manuals. i had to download the manual from Antec's website. took me some time to figure out how to remove some parts (first timer on building from scratch here).
after reading this in the manual...
Note: Power supplies will need to be mounted so that the PSU fan is facing the top of the case. The
Nine Hundred Two provides mounting holes for power supplies with standard mounting layouts to be
installed upside up or upside down.
I opted to place the PSU upside down with the 120mm fan on top. And also as i predicted, one 4-pin power cable connected to the mobo came too short. I'll just re-manage the cables in the future.