The outer is 12.75"Wx16.75"D (+/-0.1")
The inner is 7.75"Wx11.75"D (+/-0.1")
The spacing between top of cabinet and bottom of pan is 1.8"H (+/- 0.1") divided into two blocks; top-of-stand and bottom-of-pan. I'd eyeball the bottom block (part of the stand) to 1" tall and the top block (bottom of pan) at 0.75".
This would make the bolt pattern 10.25"Wx14.25"D on 2.5"x2.5" blocks with holes in the centers.
I can't actually see that the holes are in the centers, that's from recollection!
I found this drawing, which says 10.2 x 14.2, so I think I'm not far off!
https://www.tormach.com/uploads/1020...sions-PDF.html
This picture shows the blocks, and also how the flood coolant comes out from the front, towards the back. (I have a couple of wood sticks to straighten the hose so I don't get trapped coolant.)