Slate Auto's bare-bones electric pickup still starts at $24,950, but a buyer who leans on its catalog of more than 200 accessories can push the price close to $40,000. Engadget's Will Shanklin showed how in an October 19 build that turned the truck into a 1970s Ford Bronco-style SUV.

The Slate Truck leaves the factory as a two-seat pickup in a single gray color, with no screen or stereo. Owners can convert it into a five-seat Fastback or Squareback SUV or an open-air version. Engadget chose the Squareback, which raises the starting price to $29,950 and adds a roll cage, extra airbags, a three-person bench seat and the squared-off shell.

How the bill adds up

From there the add-ons stack quickly.…