Wow....retractable gear and everything! Yeah, SPITFIRE is the first thing that popped into my head when I saw that. Lot's of aero advantages to a planform like that I understand, but a royal PITA to build, and a bigger parts count, compared to a constant chord wing.
What I'd really like to see.....is a aero drive like my Prius has. Hell, I put 1300 hours on a Subaru powered airplane, maybe I ought to yank the Prius driveline out and try it! Point being, a hybrid rather then a pure electric is what I can almost see in my future, a smaller ICE but when helped out by the battery still plenty of thrust, combined with super economical cruise. Regen during descents would be a really cool feature! No free lunch though, if that ever happened, it'd have to impact the glide ratio, as in a windmilling prop has a lot of drag, way more then a stopped one. When I dead stick ridge soar my plane, the increase in glide from an idling prop to a stopped one is dramatic. https://www.youtube.com/watch?v=8J9v433C0nM