Previous winner Ideas
Well, most of the ideas are written by the MnF members, people like you and me. So, depending on which idea you want to see the script for, you could just ask and chances are that they'll still have a copy somewhere that they can share. But some of the writers for older games are sadly no longer around, so you probably won't be able to get those written ideas.
Though if you're looking for The Sinsomes one specifically, those games were created by Serega himself and we've never seen the written script. You could try asking him if he could possibly email a copy to you if he has one, but I wouldn't hold your breath.
Are there any specific games you want to see the written ideas for?