And spears, swords, axes, and assorted other primitive implements. Been that way since grade 6 when I worked on a school project.

I would think once the cast is made, the poly would be a much cheaper and more available cabinet material than MDF. I don't know if it would be accepted by the market.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated