Thanks for the advice.
From the looks of it, I could get Planet Bike or SKS fenders, though they'd be a special order in either case. I suppose it's worth it, though.
Also, I considered the
Escape R Disc, but I don't know... it's the same price as the R2, but significantly heavier and with a chromoly fork instead of the carbon. Would the trade off of several kilograms and the need to find a non-Giant rear carrier be worthwhile?