Last night, I pulled out the transmission and set it on my workbench (read: tailgate)
I pulled all the extra bolts and alignment pins out - anything that stuck out on the flat side that attached to the engine.
I flipped the tranny down onto a sheet of tagboard so I could outline it and mark where the holes are.
Tonight, I am taking the tagboard template and the motor end cap over to the machinist's.
In the photo, you can see the motor end cap flopped on the template. I think I will leave measuring the end cap up to the machinist. It has multiple thicknesses and I wouldn't be able to center it right anyways.
Yesterday, I also bought two Lovejoy couplers and a "spider" that goes between them. I picked up both a 1" and a 7/8ths". I already bought one that will fit the motor driveshaft earlier, but they didn't have any for the Metro tranny at that store.
I have the "hub" from the tranny shaft and a drum brake part that fits on the splines on the motor, so both parts should weld up fine to Lovejoys to make a complete coupler.