Paul,
Here is a very comprehensive outline of building a foam wing written by Dan Winship, a topnotch builder.
http://winshipmodels.tripod.com/foam_wings.htm
Most every detail that you can image has been covered here.
Don't forget to use the *search* functions on all forums, and of course, run a search in Google. You will probably get more information than you really want.
Here is another source of information on foam wing construction. It's a video by world class builder , Bob Noll. Unfortunately, it will not answer your questions about bellcrank installation, etc. as it is oriented towards RC. Still, it is suberb information and a 'must see' video for your collection.
http://www.airbornemedia.com/store/rv-fwing1.htmCheers.
Warren Wagner
p.s. When I added the second hot link, the first one refuses to work. Just "Copy and Paste" the first link into the Address window on your browser.