Some have pointed out that the engine might be slightly bigger given the less than continuous geometry of the nozzle and the body, but we'll see. I think i.e. said that the ventral stabs are here to stay. I trust his judgement since he's actually a professional.yes its a simplification, that 20% might account for a digit or two of decibels in LO measurement, and Americans went to great lengths pursuing it
about tail aspect, redesign will depend on the new engine, how increased thrust and different control will affect flight, how TVC affect flight laws, elimination of ventral stabs(probably?)
and WS-15 cant be at the same size with AL-31/WS-10 can it?