I suggested those two examples for exterior design inspiration. It looks like you have a clean sheet design. You've already settled on your cooling configuration at a downstream horizontal plane, hopefully redirecting cool air from your underside flow channel. Not sure about steady flow because the upward sloping belly pan is a low pressure plane. Just like the sample, Bentley Speed8, the top roof scoop has high pressure flow for the engine air ingestion. Efficient cooling NACA inlets & scoops will need to be placed at high pressure surfaces. You also have an engineering target of the 'magical' zero lift at any/all speeds. For handling safety, agitated gusts, large-vehicle vortex turbulences, & crosswinds are held in check at higher speed limits by useful downforce. A lesson learned, just check this out.