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Stephen, I would recommend that you make a smaller mirror first , say an 8" and then a 12" by hand before you even consider a larger mirror by machine. Working with machines is a bit like 'knitting' by remote control. If you don't allready have an intimate feel of the look , sound and smell of a polishing tool that is in good contact with a mirror , you would have no hope of learning how to figure a 20" mirror with a machine. In any case , the best opticians I know use both machine and hand polishing to make mirrors to perfection.
Regards the tool materials, go for the hard porcelain white tiles , not the soft clay tiles with porcelian finish.
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