The automotive term for this plate Mr.Roper is making is a "windage tray". Anyone who uses this does so for a number of reasons. The highly modified trays are made so they just miss the arc of the c/shaft and rod.This purpose is to catch the oil spray from the clearances of rotating parts.The theory is to cut down on the effort of the crank traveling through a rain of oil. The next reason is to act as a baffle in the crankcase to slow down the sloshing of oil through turns, stops , etc. These are theories at worst. I figure if high performance engines have them you can too. You want the best and you are going to have it. Isn't that the reason you have a V11.
p.s. People pay BIG $$$ for carbon fiber slip-ons because they are visible.Installing this is "your little secret".