Keep winglets/tipfins, make it aesthetically pleasing and it sounds like a winner.I can see a lot of advantages to a design arrangement like this for an aircraft with the same goals as the Facet Opal.
Keeping the same low aspect ratio while enlarging the root chord allows more of the fuselage to be buried within the wing, which can provide a much-needed increase in cockpit room for improved pilot comfort, while also lowering wing-fuselage interference drag.
A taper ratio of about 0.5-0.7 seems about right.
Mounting the vertical fins/rudders further outboard on the wing has the advantage of a greater lever arm, thus allowing a reduction of vertical stabilizer area, and associated drag.
Putting the fins all the way out at the tip (IOW, installing proper winglets) might be even better, providing an even longer lever arm, though this gets you away from the jump twist concept, thus requiring a different control surface arrangement.
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