you could do it a few ways
The easiest in my opinion is to just make a hud that will diplay the map when a key is pushed.
There is also a model pack can't recall the number that lets you create all kinds of stuff like that.
in the past I have just used Gimp or paint.net to create a map hud, I have imported paper textures from CGtextures.com or used no texture and a little low opacity green screen color to produce a semitransparent hud.
youd just have to write the script for the map to appear when a key is pressed and place it in the main of a trigger.
I have attached a link to a scipt that you might be able to work from.
either way place it in the main of a trigger.
http://forum.thegamecreators.com/?m=forum_view&t=196813&b=23