I used a dremel on mine ... used a saw blade and roughly cut them out, then tidied it up with an abrasive pad. I found it easy to cut from the back as the moulding marks for the honeycomb are obvious and that way you don't do any damage to the "outside"/visible honeycomb.
Here's a pic ... I only cut the drivers side ...
Here's a pic ... I only cut the drivers side ...

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