i'm trying to get my parents to let me download the modding stuff for christmas, unfortunetly its hunting season right now and computer games is the last thing he could possibly care about right now...... but i wanna get him to look tonight.
All you need is FS2. You can make SCP compatible missions is retail FRED, but you just can't use any special SEXPs. And if you have an e-mail address, all you need to do is get the mission/model/texture/effect e-mailed to you and then copied directly into the appropriate FS2 directory. I mean, it's not like your dad goes looking thought all the folders on the computer looking for stuff that wasn't there. And chances are they would not know the difference between something that came with the game and something that someone here made. Even if they found it they would be like "WTF <your name here>, what is this 'bomber-t03.POF'? Are you downloading various inappropriate materials for your viewing age?"
You just gotta be a little... sneaky...
EDIT: I am not endorsing you sneaking around house hold rules. Be sneaky at your own risk. I hold no responsibility for you getting caught being sneaky.