Batteries:
4x12V deep cycle lead-acid, 18AH
Charger:
100-220V 17AH charger from scooter
Controller:
Controller salvaged from scooter
Conversion time and cost:
6 months thinking, another 6 months thinking, 1 week of converting (we're not mechanics), about 850-1000 euros
Lighting:
LED lights, optional 8x8 LED blinkenlights matrix
Method for 12v system:
transformer salvaged from scooter
Motor:
Rear wheel from an electric scooter, 500W, 3/4HP