Finally Found Fat Fenders!
When I first got a fat bike, I started looking for fenders to fit it. At that point, unless you built your own, or modified a smaller fender, you were out of luck. I ended up with reshaped motorcycle fenders on my Salsa Mukluk.
Recently, I stumbled across this site:
I bought one of their fenders for 4" tires, but I did not buy the hardware kit. I figured I could come up with my own, for less money.
If the stays end up not being being sturdy enough, I will make new stays from aluminum flat-stock (that's what the Big O kit comes with). In the meantime, I'm glad to have a big wide fender over my big wide tire.