I was just wondering when looking at my frame last night if that would work. I know with it been round there's only one place to put the hole, unlike some of the os brake bridges where it's more like a slot.
Have you had a little mock up, won't it look odd with the v mounts?
i will make sure all fits when the wheels come before any drilling. i know its a shame about the V mounts, might have to carefully cut them off...