Baitshack, I wouldn't worry. Trust the designers. I don't think you had to add extra pieces. I built a plane last year with the identical configuration, but the instructions were clear that the pieces wouldn't fill the gap, and you should just butt them up to one rib. The plane has proved to be VERY durable (don't ask how I know!)

I've seen a lot of crashes (quite a few of them my own), and in my experiences, wings are very strong between the tip and the fuse (if a wing breaks, it is almost always at the fuse). Don't lose any sleep on this one, when there are so many more interesting dilemmas to worry about, such as nylon vs metal clevises, and z-bends vs solder, etc.