There is no such thing as a shot down dream, unless you yourself shoot it down. You have the right, and power to do whatever you want to do in life. You can build a 10A Rotary N/A FD if you want to, and that is your dream. Just don't many people to approve of it.
Herblenny has a lot of valid points, however, life is not always dictated by logic or the "correct answer".
If you want a 20B N/A Cosmo, then do it! It has been done before, and there are plenty of pretty fast cosmos on this earth.
Do what makes you happy!