Using player/stage with custom robots

Hi,

i am trying to implement a robot population which can detect other 
robots via sonar/ranger devices. Unfortunately, my robot position model 
does not work as intended.
This is my position model:

define robot position
(
     model()

     # actual size
     size [0.1 0.1 0.2]
     origin [0 0 0 45]

     bitmap "bitmaps/circle.png"

     # positional things
     drive "diff"
     obstacle_return 0
     ranger_return 1
     laser_return 1

     # sensors attached to robot
     laser_sensor()
)

and my robots look like this:

robot
(
     name "r0"
     pose [ 6 6 0 151]
     color "blue"
     ranger_return 1
)

Without the model() line the rangers do not work correctly. They only 
detect walls, not the other robots besides the ranger_return 1.
With the model() line the rangers work correctly. But somehow, the 
robots have not the intended sizes, colors, and shapes.
I attached screenshots to show my problem and the world file. I use 
stage.hh to setup my world and control the robots.
Does anyone know how to fix this problem? If there is more knowledge 
needed to fix this problem please ask me.

Greetings,
Christof

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include "map.inc"

paused 1

# configure the GUI window
window
(
	show_data 1
)

# load an environment bitmap
floorplan
(
	bitmap "bitmaps/empty.png"
	size [30 30 1.5]
)

define lasersonar sensor
(
	# define the size of each transducer [xsize ysize zsize] in meters
	size [0.01 0.01 0.01]
	# define the range bounds [min max]
	range [1 2.5]
	# define the angular field of view in degrees
	fov 361
	samples 360
	# define the color that ranges are drawn in the gui
	color_rgba [0 1 0 0.5]
)

define laser_sensor ranger
(
	lasersonar( pose [0 0 0 45] )
)

define robot position
(
	#model()

	# actual size
	size [0.1 0.1 0.2]
	origin [0 0 0 45]

	bitmap "bitmaps/circle.png"

	# positional things
	drive "diff"
	obstacle_return 0
	ranger_return 1
	laser_return 1

	# sensors attached to robot
	laser_sensor()
)

robot
(
	name "r0"
	pose [ 6 6 0 151]
	color "blue"
	ranger_return 1
)

robot
(
	name "r1"
	pose [ 5 5 0 -107]
	color "green"
	ranger_return 1
)