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View #2
Parts for the "funnel" to fill the hollow walls with perlite. 2" PVC and a bowl mad from a 4" cap. The adapter in the lower right is designed to fit on the cabinet face over a hole that will be cut. The holes will be covered with a metal electrical box plug. A couple of different fittings allows optimum alignment. All this took about an hour to make.
Ultimately this did not work worth a tinker's dam...