MDF was probably used for development simply because it is easy to machine, dense and inexpensive. A platter made from Acrylic is many times more expensive and departs from the design goal. We may use another material for the platter but it will have to be dimensionally stable, inexpensive and not affect the measured performance in a negative way. The current MDF platter in the engineering sample works wonderfully in regard to providing a perfectly flat, round non-resonant surface.
