[captainpeter]

I only cheated a tiny bit to get the image traced into an outline. (Adobe Illustrator does this)
You could of course draw the path in AC3D which takes probably an hour compared to a minute in AI. Once I had the outline shape I made sure it actually is a closed path and extruded along the -Y axis with 'cap end' & 'flip new surfaces' selected.

I assume the 3D printer would not care if the top face is triangulated, quads or not.
As long as the faces are perfectly flat that is...
You'll end up with tri's if you cut out those white areas within the overall shape.

peter