Yup, the first adapter plate I made was all F'ed up since I presumed it was symmetrical. Plate looks neat hanging on the wall.
Your measurements are far more accurate than mine are. I now am using the DRO on my milling machine that has greatly improved my measuring but you have the real tools to do it right.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.