I have done some hobbywork on my verry rusty dump fenders
On my bug i will use fiberglass fenders... and I'm now verry doubting if I will make some openings in the fender or not.. (the future will tell)
p.s. the openings will not look like this above.. If I do it I make the vains on the inside of the fender, so nothing sticks out the fenders.
Greetings Wiebrand