The DoubleEnder is in a state of constant evolution.
In the meantime here are some general specs:

Powerplant:         2 × Rotax 914 (modified to 130 hp each)

Total Hp:              260 hp

Propeller:             Warpdrive 3 blade 72”

Fuel type:             Premium or 100LL

Fuel Capacity:     103 Gallons (Wings Tanks = 48 + Optional Belly Pod              
                             = 55) 

Endurance:          9 hours with optional belly pod

Range:                  970 miles

Cruise Speed:       115 mph

Landing Speed:    36 mph

Empty Weight:     1500 lbs

Gross Weight:      2500 lbs