Tengden is known for adding a pusher propeller to the center fuselage for their twin engine UAVs so it's entirely possible.They could technically make a five engine version.
Why is the fuselage painted different from the wings?
At four cubic meter, 1.5 ton capacity you could fill it out with all sorts of gear. Although if it's going to be used for cargo then you'll have to open it up from the nose if it's got a pusher engine.
Speaking of opening up by the nose, I really dig the paint job for the TB0D. Coupled with the shape of its fuselage and how the satellite radome just merges into the top of the fuselage it looks a lot like some sort of miniaturized Antonov.
Tengden has already said.