Wasn't too bad, although the modifications are really not ideal for anyone using more than one 3.5 hard drive.
I had to remove the actual tray that holds the motherboard down, So I had to drill out all the rivets, thankfully the rivets are aluminum so they drill out with ease, and they are easily replaceable with any PSU screws that you use to mount the PSU ( Hex tip / Phillips? )
So with the tray out, you'll notice the main issue is the openings for the wire management / Hard Drive rails are flush to any large PSU, leaving no space.
Resolution, you need to cut 2/3 of the Left side rails, by doing this, if you flip your hard drive upside down, the top rail becomes a 4th rail, and the hard drive slides in snug to the roof.
Id attach pictures but 1, I'm at work and 2, I don't want people seeing the shitty cut job I made.
Other than that, looks great to me, I love this case.