Watch case back design for engraving

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This customer received 17 vector designs from 8 designers. They chose this vector design from JMD as the winning design.
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We need a vector design of an old "W-Class" tram (from Melbourne) done that will be suitable for engraving in the centre of a stainless steel watch case back.
Some examples of laser engraved case backs are attached so designers can see what kind of detail works during engraving. It cannot be too complex as the machinery will not be able to handle it.
We only need the centre design, not any text surrounding it. Ideally the design would include the tram on a street, as long as it all fits within a circle cleanly.
FYI - a W-Class tram looks like this:
http://thumb7.shutterstock.com/display_pic_with_logo/668929/188715065/stock-photo-melbourne-aus-apr-w-class-tram-in-city-circle-service-it-s-a-zero-fare-tram-aimed-188715065.jpg
Updates
Hello, we are working with our factory to determine which design would be best for engraving on the watch. We will select one soon.
Added Friday, May 16, 2014
Industry/Entity Type
Steel