I agree with the heavier base. I also recommend cutting a piece of rubber matting, like you stand on when working of a lathe, and bolt the machine down with the rubber sandwiched between the base and the table. I tighten it a bunch and in my own mind, I think it also helps to reduce vibration and harmonic vibration.
What is your opinion of springing the tension from the back side from a welded arm down to the bottom of the table instead of underspringing?
I wish you well, on a very nice design.
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