https://news.engin.umich.edu/2017/07...lar-challenge/
https://www.msn.com/en-us/autos/auto...cid=spartanntp
This 4-wheel solar car can go highway speeds and has .1Cd. It is raced on public roads in a region complete with foul weather and high winds but I don't know how much interaction the racers have with other traffic.
You need not worry about whether your one-off is a trike or not for safety regulations; it won't be crash tested and if it has the lights, horn, etc. your State requires and it passes inspection, it's golden.
1fr/2rear trikes can be more than adequately stable. There are more of them than tadpoles.
That orange tired thing has a loooong way to go to be classified as a Morelli shape! I mean, there's a kinda-sorta overall similarity but the Morelli is all about aero and that orange tired thing has the aero of a barn.