They have already built several conversions and the Ferrari 308 GT they did was featured on Top Gear. They use the existing transmission with a torque controller to adapt for the transmission. The batteries are LG 46.66 kWhr and built into the engine case along with the charging system. 130 mile range and they have regenerative braking adapters on all 4 wheels.
The only part that is out in the future is commercial production.