As per BMW Group’s press release, the idea for the pickup was that the folks at BMW’s M division wanted something to haul more than just people around campus with. So rather than just try and stuff a bunch of transmissions, radiators or burnt up tires into a pretty M3, they instead took a 3 Series convertible and ripped out the back seat, trunk, and roof behind the driver. They then riveted in a series of billet steel panels to take the use and abuse of guys throwing tools, parts, and whatever miscellaneous junk into the back of the car without causing the same amount of damage those actions would cause on the leather seats that were original equipment.
In a BMW Group press release commemorating the M3’s 30th birthday, Jakob Polschak, who is the head of vehicle prototype building and workshops at the aforementioned M Division said, “The convertible body shell was chosen as the basis for two reasons. Firstly, we happened to have such a model at our disposal and in perfect condition. And secondly, the convertible’s built-in bracing made it the ideal choice for a pickup conversion.”