Do you have the broken bits? If not, just get yourself another one. If you do, my solution to repairing plastic is this:
Using a soldering iron, melt all of the cracks together on both sides, Sand the ridges on the face off and clean it well. Use Araldite to fill in the soldered areas, and the back. Apply more Araldite to the areas where you can like the back. I find soldering in a criss-cross pattern to the flat sections on the back gives it something to bite to. Sand it all smooth then paint it black to mimic the factory finish.
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