I need some help with how to frame this poster

This one to be exact. Sure, I got a frame from Ikea big enough, but... actually getting it framed is a problem of its own. How to keep the poster from touching the front plastic, whether the mat is acid-free or where to get one that is. I'm considering just putting it back inside the case it came in until it's sorted. » 3/04/15 12:44am Today 12:44am