I think that the R nine T fender may be too wide even if the wheels are the same diameter (17")would be interesting to know if the R1200R fender would fit on the 310. Seems that the R1200R fender in red is longer than the fender in black when you look at the pictures on the BMW website.
The R nineT fender would look awesome if it fit onto the 310, wouldn't provide any more coverage, but would look very cool.
The accessory manufacturers are starting to get going on the G310R. Givi will soon start making screens, racks, handguards etc. Wunderlich are also making some parts as does SW-Motech, Puig etc.Kind of disappointed there has been no one so far that did custom work as yet since the G310R seems like a great platform to me, custom fender is what i'm after.