Building light is all in your technique. How much adhesive you use to join each piece of wood can play a major part in weight control. When sheeting foam core wings, you should WEIGH THE SHEETING to ensure that the weight of the sheeting for the left wing is very close to the weight of the right wing (this will help avoid having to add too much weight to a wing tip for lateral balance.)

Check out this thread for some ideas.... [link=http://www.rcuniverse.com/forum/m_1504703/anchors_1504703/mpage_1/key_totally/anchor/tm.htm#1504703]Great Planes EXTRA 60 size.....totally 3D[/link]