Mounted the PSU with fan on top as most likely the tower is going on carpet.
Loads of wires D:
I have installed the very handy USB 3.0 hub that came with the mobo, and also the optical drive:
Now, the case comes with 6 standoffs, and the motherboard has 10 mounting holes? I have figured this may be the best positions for the 6 standoffs:
EDIT: I have moved the bottom left standoff to the far bottom left, so the positions are in logical 3 row positions