[Etoys] how to crop display

We want to present individual Epaath projects through a web-browser and want to do away with the sugar navigation bar so we can use the screen real-estate for html navigation.

Removing the bar itself isn't the problem, but the hole it leaves behind is, as is the coordinate system. So I'm looking for a way to crop the display. There seems to be some provision for this in the Display classes (the instance variable clippingBox for example, and zooming functions), but I'm having difficulty finding where, and/or how to change the code so as to do some actual cropping.

Any help would be welcome, /Ties