Are you running the Volt generation unit also? I would be down with that one. I have only seen one but there is a volt running around that has a diesel powered generation unit. Last time I saw it pop up, it was getting a true 126 Mpg, think diesel locomotive, very same concept.
As for all the stuff, all he needs down the center tunnel is the batteries, everything else can be ran out the logs if need be. A 5 gallon fuel cell will get you a pretty far piece as the volt is a hybrid, and the Bolt was the true electric.
Best of luck with the build, your resume suggests you can work out the drive sync issue with a bit of software and a controller. Couple of wheel sensors or flange sensors and you could sync them up no issue.
BTW if you look at two builds on here your center tunnel should not be an issue, and you will actually increase rigidity if done correctly.
Thanks for the update and carry on.