RE: 80" Cap 232 Modifications
You may want to take a look at some pics of a Carden 40% Cap and see where they placed the stab. If I am not mistaken, GP has a .40 size cap kit and in the instructions they stated that the dihidral was more than scale and not to change it as it would adversly effect roll coupling. A chat with Peter Goldsmith may prove useful as well.
Shawn