I say go for the acrylic--less undamped resonance. Let us know how it turns out, there are problems in this project that will be interesting to solve.
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You want to use Acrylic, thickness is very important for motor alignment etc. The Plinth can be machined to any configuration you want. This is best done on a CNC. The Platter can be 1" or thicker and this also should be done on a CNC machine. Send me your e-mail address and I will forward photo's of Acrylic Plinth and Platter if you like.
If I can help you let me know, I have been in the Acrylic business 38+ years.