Pictured on the left is the front of the car, specifically the radiator as viewed from standing just behind the left front tire. The car comes with this custom radiator essentially installed, but the fans just come on their own without any brackets to mount them. That’s a where a fan shroud comes it. It serves as a mounting point for the fans and it also more or less forces air to go through the fans and not around them.
Enter a piece of aluminum, a jigsaw and some very precise measuring. In the end not a very difficult task, but you have to get a lot of measurements exactly right. Below are the simple steps after purchasing a piece of aluminum cut to the width of the radiator and high enough so that I could screw it into the top and bottom radiator cross-brace.