In college I studied mechanical engineering because I wanted to build racecars. It was a mistake. A Bachelors of Science gives you certain tools but at the risk of giving a big head as well. At the very least I learned to research a topic before attempting a project. In the end it comes down to sound thinking, and the right tools
I do agree that spending the time on safety considerations is very important and most of us don't have access to sophisticated mathematical modeling software. Using recommendations from sanctioning bodies such NHRA and SCCA can be helpful. A trianglated frame is good but using stressed panels with a tube frame can be effective if done properly.
When I owned a 2 door car, I would move the front seat forward after I got out if the rear seat passenger needed the room.