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Comparing what’s here to what’s in the photo of your motor in progress, the driveshaft for the mag and the bracket that holds it in place are original. I can’t tell from the photo what that contraption is where the mag should be, but it seems to be more than is necessary. And I can’t see from the photo what the lever with the red handle goes to. There is no need to mount a condenser on the motor, that would be part of the battery box with a Model T buzz coil in it.
The gear on the mag drive shaft should have either the same number of teeth as the gear on the flywheel, or twice as many. If it has the same number of teeth, then it rotates at the same speed as the flywheel. If twice as many, then it turns at half the flywheel speed. Any other combination is probably wrong.
A battery box / coil will have three leads coming out of it. One goes to the spark plug, that one should be obvious. Of the other two, one goes to the motor ground, and one goes to an isolated contact. If there is continuity between these two, the coil will be active, and spark will be generated. The good thing about this arrangement is that as long as those leads are connected, spark will be generated. It’s not like a magneto where you get one spark.
Lets say there is a screw sticking out of that drum that is supposed to mesh with the missing magneto. Mount an electrically isolated flat piece of brass under the drum, so the screw contacts it when the screw is point downward. Hook the battery box leads up to the motor and the isolated contact, and you will get spark when the screw hits the contact. You won’t be able to adjust timing with this arrangement, but you could certainly get the motor running.
I am going out on a limb here: Is it possible that the mechanism mounted in the photo above is installed incorrectly? It may be that the round thing has points in it and it should be rotated 90 degrees so the back of it meshes with the mag drive. Tough to tell from the photo. If you can get more photos of that assembly, we could probably figure it out.
Email me at manleyt1923@gmail.com if you have questions, need more information, or want help rigging something up.
Tom