HELP! Louver Transition from Vertical to Horizontal

Hello Guys,

i'm running into a problem for a facade design. I'm trying to design a louver system based on the two images I have attached, the lover is vertical from the North elevation but transitioned into a horizontal system when facing the South elevation. My initial thought is maybe this is an array of elliptical offsets that's projected onto the surface, but somehow I couldn't get my ellipse to transition perfectly from a vertical to horizontal orientation. so i'm here to ask for any help! thank you