at least do the following:
-Comfortably seat one pilot
-Travel faster than driving
-Use a common enough reliable engine that’s mogas-friendly and not a never ending science experiment
-Be easy enough to fly, capable of straight-forward pilot transition from a common type
-Be resilient enough to survive outside tie down in any US state without needing major refurbishment
-Designed for scratch building using common tools and ordinary raw materials and hardware
Does not exist. The reason why is point 2 "Travel faster than driving"
In a (VFR)-airplane you can got fast from A to B but you don't know when you start, not when you will land, even less when you get back. Flights over 500 NM get often elongated by a day. If I have to be somewhere "on time", I take the car, an airliner ... or I budget 1-2 extra days.
Been there, tried it, on occasions a car should have beaten me by several days. Liked the journey with the plane more yett some highspeed runs Brussels-Munich (830 km in less than 4 hours) are also fondly remembered. I learned that there is no need for a 500HP-Porsche or BMW , an Audi A8 TDI (a lousy 350 HP diesel!) clocked my fasted time.