That is a good setup on the engine nacelles. My first thoughts were to mount the engine nacelles below the wing, but I'm starting to think along the lines of mounting the engines along the chord line, as you have done here. Except for certain special purposes, like mounting the nacelles low for landing gear or high in a seaplane to keep the props out of the water, there is likely no reason to mount them high or low, except for aesthetics.

One of the tricks to preclude tip-stall is to make the LE of the inner wing sharper so that it stalls before the outer wing. JOOC, does sticking engines on the wing alter the stall characteristics of that wing section? I can see that the airflow behind the engines can be markedly different than if the wing were moving through the air.

--Bill