After hacksawing the motor key down to size, I was able to attach the flywheel to the electric motor today. I was going to go for the clutch, too, but decided to end the day on a successful note. I'll have pics up when I get the clutch on there.
ElectroAutomotive actually e-mailed me back yesterday, saying that they are sending out a new motor mount adapted to the Warp9 dual shaft engine. They said they were sending it out next week (I wish they said they had already sent it, as a bird in the hand is far better than two in the bush with this project). They also claim that my battery boxes are coming in the next couple of weeks. I haven't gotten batteries yet and will hold off until the boxes arrive.