Well, targeting took bloomin' ages. Who'd have thought a 64x64 render texture would cause me so many issues! I spent 4 hours (!!!) trying to work out why weapon shots weren't hitting what they were supposed to, then there was a little bit of pain converting mouse input (which is in screen space) to actual usable render texture space...
But that's done now, and it adds a lot to the feel of the game, so it was definitely worth it.
