it's roughly 10-12 x 60mm that needs to be removed.
i used a Dremel bit that resembles a drill bit, except it's designed to cut rather than bore holes. from memory, it was bit #561.
cutting the plastic was a piece of cake.
if you cut a bit extra, say 14 x 60mm then you can wedge some high density foam as a cushion. i used EVA 75.
i also used the same foam to prevent any rattles from occurring due to the cables near the piping. the foam should also prevent the AC lines from
being eaten up too.
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