Made the cylinders smaller and segment cuboids bigger.
Have wheels on one side, next turn into macro and put another wheel on other side.  Also add an axle purely visual link- Some of the visual it makes sense to bake into the dae file, but if they are to be insensitive to scaling then they need to be broken- it would be convenient to be able to add a second visual tag and make composite objects.
Now have macro for wheels, and left and right wheels.  Next look at passing parameters in from launch file, and gazebo integration.