I agree with Clay, use the motorcycle as a motorcycle. The Zero is absolutely amazing! You can still tap 88-116 volts off the controller leads, but you need to keep the bike as it is. The Main Bike Board reads data from the Battery Management System and if everything is good sends a signal to the Sevcon which then closes the contactor basically making the battery "Live" at the leads coming out of it.
It is possible to strip away these safety protections, but I can almost guarantee without the BMS working with the MBB and controller to monitor the voltage of all 28 cells and protect them, you will end up having a cell go too low in voltage and destroy the pack. Not worth it. Sell the bike and use the money to buy batteries designed for monitoring and protection and communication from a solar system charge controller and inverter.
Best is to turn the bike on and you can access the controller as a power source, and the BMS will still protect the system. This way you can still ride it! The thought of tearing it apart doesn't make sense to me unless it was wrecked beyond repair.
If your dealer was selling it I'm sure it can be registered to be legal, just ask him. Where do you live? The battery on the Zero is great, but riding it is what is best.