This may be dated but still worth a look.
This pilot makes it look like part of the show. When these aerobatic aircraft fly wings vertical (or any aircarft for that matter. These are designed for it), they use the fuselage as an airfoil, a bunch of power and deft handling of the rudder and elevators. All that and some airspeed which this pilot acheived by the loss in altitude and full throttle.
So, the aircraft will need at least the right wing, maybe some landing gear work, and probably a new seat cushion!