A small update. Last night I managed to fret out a new motor bracket from nickel silver sheet. This will be screwed onto the chassis frame once I've arranged some means of dampening any vibration, almost certainly the judicious application of silicon sealant under the bracket...

While I had the parts to hand, I removed the flywheels from the big 1824 in preparation for fitting them to the new motor. These have been 'modified' (or butchered) to leave sufficient space to get the universal joint on the end of the motor shaft. It would have been much neater on the lathe but some gouging with a 1/8" drill in the Dremel did the job, eventually.

Compare and contrast:

Adam

Source: Adam's Workbench: The Return of the Greater Electro-Diesel