Brian,

I have seen two different 4* 60's fold the wing over the past 5 or 6 years, so I am a bit "gun-shy" of the stock wing center section. If you are careful you can reinforce the center of the wing and only add one to two ounces to the total weight. I did add another ounce by building it with flaps, but I really like the way it lands with the flaps. I would never clip the wings, in fact I always make up a 3" built up wing tip to replace the ugly squared off tip. I am probably getting enough additional Sq. In. to make up for the additional 2 to 3 oz.

Ralph