i suppose to make one from a sheet of ally would not be that hard or expensive, buts its to what bennefit? does it really make really make the car more aerodynamic?, does it really protect the engine /gearbox? does it make life a pain whan you want to drop the oil etc?

my 4x4 saph had its origninal fibreglass one but it used to collect sh1t and swallow nuts/bolts small tools, how many people have dropped a small bit straight down only to never find it again?