Here's something to bear in mind about the Planet Bike Cascadia fenders: They shorten the fender before adding the mudflaps. This defeats the purpose of a long mudflap.
I have SKS P-series fenders and PB Cascadias. The SKS fenders without mudflaps are exactly the same length as the Cascadias with mudflaps. The ideal would be an SKS fender with a Cascadia mudflap.
Last year I purchased the Euro-spec SKS P-series fenders, which come with a mudflap. The North American versions do not. The Euro-spec SKS fender is the same length as the North American one, but then they add the mudflap to it. It's much closer to the ideal.
I purchased a set of Planet Bike Full ATB fenders for my hybrid commuter. Then I added Cascadia mudflaps. The result is mud flaps that go lower than what you get with Cascadia fenders. I also added additional fender stays on my rear fender to stiffen it up. After riding it a while, I decided to keep the mud flap on the front fender, but take the rear flap off. The fender did well enough on the back, and I like the overall look of the bike better with only the front mudflap.