In my P190, which has basically the same hole pattern as the P182, I found that the bottom notch could stand to be a little wider, since it has to accomodate most of the cables coming from the PSU. Just the ATX and 8-pin cables alone can fill up over half of that gap, nevermind the molex and HDD power cables you'll probably want to send that way too.
Also, if you're going to use the upper HDD tray, a second, lower notch on the side will let you route the power cables straight to the drives, instead of having to go up, then down again.
__________________ i7 2600K | ASUS Maximus IV GENE-Z | GTX Titan | Corsair DDR3-2133
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