NOS (undrilled) Technics boards appear from time to time. Depending on your perspective, at over $300 they may be considered expensive. There may still be one on Audio Asylum Classified.
If I was in your situation, I would be tempted to have 2-3 different boards made up (easy enough to trace your original board for dimensions and mounting holes) then see what sounded best with the new arm/cartridge combination. I'd likely choose solid wood (maple, spruce, etc.), aluminum, and acrylic since they are so different.
If I was in your situation, I would be tempted to have 2-3 different boards made up (easy enough to trace your original board for dimensions and mounting holes) then see what sounded best with the new arm/cartridge combination. I'd likely choose solid wood (maple, spruce, etc.), aluminum, and acrylic since they are so different.