Wow, nice work! It looks quite controllable and maneuverable in what appear to be decent winds. Interesting using dual cylinders - what do you find works best

Wow, nice work! It looks quite controllable and maneuverable in what appear to be decent winds. Interesting using dual cylinders - what do you find works best about that design vs others you considered? Does this provide any redundancy (as in could you fly if one deflated)? What scale of thrust and elec power do you use (if you don't mind my asking)? Are you considering a range of sizes or just the "mid mile" 650Lb capacity version?