I am not sure that the 90 minute endurance claim is valid for a 456 sq/in wing area at 2.2 lbs. I would like to see some detailed hardware specifications and operating conditions to achieve that claim (Any LiPo batteries for 90 minutes of operation would be quite heavy, adding in cameras, FPV transmitter, flight controller, motors, props, servos and wiring I can't see how it could be done). It looks like this craft will be inoperable in any kind of wind as well with its "butterfly" flight characteristics. It fly's like a Nutball!
Having said that it looks like a single section of Experimental Air's "Armin Wing" would meet the requirements for a cheap build (copy) of this craft.