Todda is right, you need to clean everything up inside. Keep the cables tucked neatly. Route the sound cables from the Optical drives behind the motherboard. Use some double faced tape or clips to keep the ribbon cables flat against the case walls.
Like Todda stated, trim out the grills of the existing fans and use wire grill covers. Maybe get some plastic wire loom cover to use for your wires.
I suggst you pull
everything out of your case to do the clean up. Also, if your planning to modify anything on the case itself, you need to pull everything out anyways, including power supply. You do not want to get steel shavings and plastic shavings in anything. When you put evrything back together, try to plan for cables as the hardware goes in.
As for plastic, a dremel usually will melt more than cut. A hole saw works decent, but you need to make sure that your drill for the holesaw is a low rpm drill, around 600rpm so that the heat build up doesn't melt anything. While your at it. why not put in a window kit in?
Here is an idea for you that would make things a little easier. Why not put both blowholes in the side? One at the bottom for intake, and one
right above the CPU area for exhaust. This usually works very well to aid in cooling the CPU and video area. You can fab a duct for the exhaust out of sheet aluminum or even cardboard. Then paint it. This is really nice if you add a case window and a cathode light. Paint the duct a nice brilliant color to go with the cathode!
With this method, you won't need to worry about breaking/melting plastic. Also, you won't need any fancy sleeves or anything.
Here is a side blowhole above the CPU and the PS wire grill mod done. Fans are Sunon 80mm High Outputs....
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