I don't know what work it needs, but at least the cab looks great from a distance. 
Although it's an interesting-looking classic truck, mechanically it's just like converting any other conventional (longitudinal engine in front) vehicle. If you don't mind battery boxes hanging outboard of the frame (like the fuel tanks, but much larger), then the design is easy.
Unfortunately, even 100 miles will require as much battery capacity as a typical compact electric car needs for twice that distance... or more, depending on what the truck would be hauling. Also, while many EVs have a 200 HP (150 kW motor), they are not intended to work hard for more than a few seconds at a time (to accelerate); a medium-duty truck needs high power for extended periods, so it needs a big motor.
What is going to be on the back of the truck? What it is hauling (such as a large cargo box, or a wide deck) affects aero drag and thus power requirement and energy consumption, and the loaded weight matters, too.
Although it's an interesting-looking classic truck, mechanically it's just like converting any other conventional (longitudinal engine in front) vehicle. If you don't mind battery boxes hanging outboard of the frame (like the fuel tanks, but much larger), then the design is easy.
Unfortunately, even 100 miles will require as much battery capacity as a typical compact electric car needs for twice that distance... or more, depending on what the truck would be hauling. Also, while many EVs have a 200 HP (150 kW motor), they are not intended to work hard for more than a few seconds at a time (to accelerate); a medium-duty truck needs high power for extended periods, so it needs a big motor.
What is going to be on the back of the truck? What it is hauling (such as a large cargo box, or a wide deck) affects aero drag and thus power requirement and energy consumption, and the loaded weight matters, too.