<<Shouldn't be too hard to make one either.>> Depends on what you want it to look like. Just yesterday I removed the front pan from my C320 to clean up the remains of a little boo-boo from my last oil change, plus eyeball the motor mounts. The pan is held on by six bolts and is integrated with a covers ahead, behind and on each side. I know the older cars are not so elaborate but cobbling one up from sheet aluminum would add weight plus if it came off could become a lethal piece of road debris.
RLE