Smoothening out the side panel

[alen]

Hey, this is the first time im modding my PC, right now im just using a cheap 30$ case but what i want to do is cut a square on the side panel, and attach a piece of plexiglass from behind it.

Now ive cut the square out using tin snips (i know ghetto but i had nothing else at the time) and the edges are quite jagged and not proportional to a TEE, i was wondering how could i smoothen it out, using sandpaper or grinding disc, anyone whos done this before how did you fix it, and if you can post pics that would be great thanks.

-1 big n00b

[Razors Edge]

If its metal, You have to find Ultra Strong & Thick sand paper. If its plastic or simular, Use Sand-paper, But make sure you don't go to hard, You can end up melting the plastic, As it does get hot very fast.

For metal, an alternative is a grinding disk, But as again take it easy, Its hard to controll it, and if you go off track a bit, They can do quite a few dents to you're case, Some where paint will refuse to cover it up.

-regards
Razors edge