Modding my Zalman Z11 Plus

[ReliefWithBeef]

Hey guys, so I have grown rather bored of my black Z11 plus



So I have decided to make it white. I have seen a picture of how I want it here,

I've made a start by doing the front panel

But I was wondering on how I would go about cutting the side panel to allow for more window, like my target case.
Any idea's?

 

[ReliefWithBeef]

The window may not be the exact size and shape of the target, I'm not too fond of how it sticks out, and I want to put a side fan to keep my GPU cooler.