Choose a car, preferably without power steering. Remove all ICE components. 

Purchase a high power electric motor, a speed controller, batteries, heavy duty wire, battery chargers, a DC vacuum pump, a DC-DC converter, and main power relays.

Custom machine a coupling adapter for the motor to the preexisting transmission, weld support brackets. Install motor.

Create mounting brackets for all other components. Install batteries, wire speed controller and motor.

Install DC-DC converter, vacuum pump, heating coil and accelerator pedal.

Test drive.