You guys are worrying too much.

This is a tiny, extremely modern glider. The batteries will add AT MOST 50 lbs per wing. Probably more like 30 lb. per wing or 60 lb. total. And without batteries I'll bet these wings are AT LEAST 50 lb. lighter (EACH) than any current 15m wing. So it's a wash in weight, with the batteries in the wing, with a current 15m (standard, not motor) glider such as an ASW-27. I would suspect that it might be lighter than a 27 wing, even with batteries.

The prototype had a picure (99%) sure, without batteries, and the guy was carrying the wing around under his arm like a large RC glider. Maybe I am wrong on this. Anyone?

Also, aero-towing with the boom deployed (and motor ready to go) would be very easy and practical to do. I cannot think of anything that would prevent certification of that procedure. The only thing I could imagine might be she shocks on the propeller in the aero retract (sprung bach clean) position. Maybe heavy gear hits on take off roll could somehow damage it.

Sean