Here's what I did:
Measure out the hole for the LCD (and ports), use masking tape to define the boundries. Use the Dremel to cut almost to the size of the desired hole (say about 1mm away from the desired size), then, use fine and medium files to work the hole to the desired shape, carefully sizing and refining as you go. I also rounded off the edges with the fine file. Use a light touch with the fine file at the end to smooth out the edges.
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