I didn't reply earlier since it seemed unlikely that anyone who bought an Ebony SV Wholeplate would bring wet plates near it. However, since you're almost pleading now ( ), here are the dimensions.
  • Rear "box" 10-5/8 x 10-5/8 inches
  • Rabbeted area 10 x 10 inches
  • Depth of rabbet 1/8 inch
  • Size of reversible back section that protrudes inch into box's rabbet 9-31/32 x 9-31/32 inches
  • Depth of reversible back section that protrudes into box's rabbet 1/8 inch