Only a hint? Oh well, I tried.
And there are two fundamentally different versions of what is meant by “class A”; a term which predates computer use for design. One version is “how” (single span surfaces, continuity, etc), the other is “what” (quality of reflections, etc). Class A origins
Based on this forum many users have been led to believe by posts in this forum as well as recommended videos that single span surfaces are essential for high quality surfacing, and use of multiple span surfaces are a sure sign of lower quality work. The MG model shown above is a good counterexample of achieving class A quality surfaces with multiple span surfaces.