As I have said before I would really like the project to have something like the Marvel Cinematic Universe Quinjet (fusion powered of course).
Mach 1.2
Crew 2(/3) +14
Cargo 4.8 tons
Vtol
However even with really advanced material technologies (carbon fiber/frame, high temperature -2400K ceramic heating elements-> true electrical Mach 1+ jet engines), I have a hard time getting the physics to work.
But if Mobility and flexibility are goals of the project nothing would beat it.