I haven't used KraftMaid for a few years, I am not sure if the inside of that space is finished... It may be a maple interior standard, so I would recommend finishing the interior of the cabinet to match your cabinet color. The opening comes at a pre-determined size, make sure your micro will fit. The benefit to the trim kit is that when we need to make the opening larger, the trim kit will cover the the exposed edges.
Lonny at K and B
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