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Regarding the top, I had a great learning experience. I built a car top that had a front which just continued the front windshield line up about 1.5 feet, then flat top and a flat back.
What I learned was accidental, but very relevant. I had some firewood I wanted to take, but we were out of room. So I put a tarp down on the top, stacked the wood on the tarp, at the back 1/3 of the carrier and roped the whole ensemble to the roof racks.
I figured I would be lucky to do 55 and pass a gas station. To my extreme surprise and delight, I was able to get about 22-24 miles/gallon in a car where my best mileage was around 24. It surprised the daylights out of me.
I would expect if you don't do something with the top shape, you are likely to get a lot of aerodynamic drag their.
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