The main dimension from the top of the playing surface to the top of the armboard is approx. 27mm in distance for Rega tonearms. You can do the math with your existing hardware to achieve 27mm. This will get you close enough depending the cartridge you are using. Since you mention the Denon, you may want to reduce the distance to 25mm, or even less. I would do a mock before fabricating the finished product anyway.
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