Ya i did this with my siters computer couple of months back
Here you can get some dope window kits that are so easy top ut in, my mom could of done it.
THen if you want get a top window mod with 2 80mm fan holes o top, you are going to have to measure to see if everything below the top will be not disrupted.
THen on cable get all rounded 1de cables,(cleans up the inside of your case air transfers better better cooling.
Get some fans that are led or that are uv reactive,
Stick a Uv reactive Sound polsating cold cathode in there with a cold cathode green. Then get some wirelooms and cover all of you wires so they glow, THis is all pretty cheap, 100 bucks and you will have the coolest inside in you moms basment