When I did my oil change i noticed the same thing. I'd like a flat bottom down there if anything more so for the aero and the MPG increase on the highway. I'm in the thinking/planning stages of making one for myself.
A pan under the engine isn't at all for weather protection. It is for aerodynamics. My focus ST has it. The fiesta is still a economy subcompact. The focus and escape are more mainstream. the fiesta has to meet a price point. The pan is above the price point.I finally put my ST up on the lift today and was surprised to see completely no weather protection for the engine on the bottom. In the northeast, everything will get covered by salt.. Was there ever a Fiesta model with a bottom pan that I can purchase and retrofit, does anyone know?