First of all thank you for a great simulation tool. I have hacked together an apmrover and a Raspberry Pi 2 which gives essentially your Erle-Rover. Without your urdf files it would have quite a deal of effort to put together a model. And I quite the simulation with Gazebo which will allow me to speed up prototyping.
Anyway I'm trying to launch rviz like so:
roslaunch ardupilot_sitl_gazebo_plugin rover_spawn.launch model:=rover.urdf gui:=True
But I'm getting errors which talk about not finding the rover.urdf. Is there a preferred way for erle for launching rviz off the urdf models?