Hey Bouni !
Help with the graphics is VERY welcome ! We need a lot of schematics !
Actually you can get a free Smoothieboard if you enter the Smoothie contest with an entry about making schematics : smoothiecontest.org
So here's where things are at : I asked somebody to make a SVG of Smoothieboard, and they are nearly done doing so, but have not been able to put the final touch. I would recommend you wait until the final version is available to use it.
Once that is ready, I will be integrating the SVG into Fritzing, and then we can all use Fritzing to draw the schematics.