It isn't too difficult to implement that. I'm assuming that Cartography Shop exports to the .X format. You just load the matrix with the file MatEdit exports, load the .x, and place everything where you want it.
To make it even simpler you could go to the Showcase and download MagicWorld. It has an easy to use interface for matrix editing, and you can place 3d objects on terrains. It comes with a function that loads the maps exactly as you created them in MagicWorld.
Crazy Donut Productions
Current Project: KillZone