Someone tell me why this is a terrible idea. Trying to get more Z clearance

I DO have a full 1/2" thk (Black) Aluminum Bed (Table), but it isn’t flat enough for my needs (it had a 0.015" crater), so I bolted a 16" x 14" (0.022" thick) aluminum plate, and then meticulously, machined it flat within 0.0005".

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