We see the engines hanging in front of the radar antenna. It might be a reasonable to fit the engines above the wing leading edge as in the XC-14 and the An-72. That means an air frame designed for this function ( as indeed the E-2 was ) rather than a "cheap" adaptation of an existing transport aircraft an in EC-121 and its successors. Of course XC-14 and An-72 were designed as transport aircraft so will someone design such a transport aircraft to be able to make a good adaptation for an AWACS?He's modeled a hypothetical of what a Conformal Airborne Early Warning variant might look like.
Instead of using a dome the Radar is mounted into the hull allowing a radar picture not as interrupted by the aircraft it's self.