Aerodynamic car??? It doesn't have the fineness ratio of the kayak on the roof.
The trailer would be better with a center spine frame, like a Westfalia or old Silver Streak.
Remember the Porsche Type 64 replica someone was making? These guys decided to make the original Tucker 1/4th scale model:
https://www.wired.com/2014/10/tucker-post-war/
The aluminum panels Cleclo'd to an eggcrate buck is about 75% done. It will have an aircooled Porsche six. My first car was like the 4-door 6-pasenger notchback version of this.