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Yes, I have... and I would have done it if I had thicker PCB copper cladded fiberglass plate at hand (even single-sided would be OK).
I think the approach with aluminium should be mechanically more stable than standard 1.6mm PCB. Also, I can open the aluminium box much easier, in case there is a need for minor adjustment (like length of the rods are not adequate, or tap needs to be moved a bit to get better matching...).
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