Hi,
Not sure how detailed you want it, but if you have the texture (its from top, great), try using it.
Here is very rough representation of what you can get from this texture and very little modeling.
If you want to model it (and get it as in the image), I don't see any other thing (not even topology tools) that would speed things up - model the piece one by one, inset/extrude them.
Hope this helps.