Building a roof is one of those activities that doesn't seem hard on paper, but is. When you describe a house, you call it "a roof over your head," right? Houses live and die by their roofs. Even a small screw-up could reduce the rest of it to complete rubble.
This is not the case with automobiles. With a car, you can buy a car with no roof at all. They're called convertibles. If the factory doesn't produce a convertible version of the car in question? You can buy a specialized tool to convert it. That tool is what the industry calls "an inexpensive sawzall that you can return to Home Depot when you burn out the motor trying to saw through a B-pillar with it."
I've owned a variety of convertibles over the years, many of them intentionally so. There's nothing like the feeling of racing around town with nothing between you and the rest of the universe. Much like motorcyclists feel before their third carb re-tuning of the morning, you feel like you are a wholly integrated part of where you are driving through, instead of some kind of passive observer in a box that flattens children.
Of course, convertibles do have their downsides. The seal is never quite waterproof, because water is tricky. There's a complicated mechanism to take care of, even on the simplest cars. Idiots will try to cut a hole in your roof in order to break into your car and steal valuable things that you can't afford in the first place because you keep having to replace the roof. And, above all, there's the wobbliness. Conventional structural engineering states that cars are meant to have a roof, mostly because they weigh several thousand pounds, especially when some jerk is throwing them around corners with reckless abandon on the eve of their 40th birthday.
Don't worry, though. The car industry has also produced a solution so you can have a nice hard top on your car while still enjoying a modicum of wind inside the cabin. It's called a sunroof, and it also includes the fun of tracking leaks and mouldy smells inside your perfectly good car. If you ask me, though, I'm going to stick to the sawzall.
