Showing Minimap/GPS as PiP texture

[chronicsilence 13]

So here's the goal: I want to show the minimap (ctrl-M) as a texture on an object.

 

I know that you can take video from a camera and put it as a texture on an object (like a laptop screen) using cameraEffect with rtt (like in KK's tutorial here), but I need to find a way to do it with a feed of the minimap instead of a feed from a camera. One interesting thing is that the cTab mod seems to kind of do this by rendering a minimap in a custom position in 2D, not exactly sure how they did that though.

 

Any thoughts? Thanks!