Finishing the stab & elevator assembly was a slightly finicky job. The second skin is applied while keeping the assembly in a saddle to ensure that it is held straight, and then a balsa LE is added. The tip is a clear plastic moulding. It looks like there should have been a "double" tip rib for the stabs, such that the pro-skin is applied to one, and then the plastic tip is trimmed to lie over the other. There was no such rib supplied, so I just made one up.

Here are a couple of pics of the stabs with elevators in place.