Steve,
Three sources of VHS tapes on building are available:
1. Windy Urtnowski has tapes for every step of building and finishing every model he has made over the last 10 to 12 years. You can watch detailed information on building a Nobler, Cardinal, Spitfire, Seafire, Tempest, Miss Ashley, and B-25 from developing plans to cuting wood, building wings, "fusselege" (feeble attempt at a Brooklyn accent) Windy's finishing techniques are the gold standard for any PA modeler. See his website for details.
2. Bob Hunt has a number of tapes on aspects of model building. His lost foam wing technique is covered on two tapes. He also has a tape of Bill Werwage building an I beam wing and How to paint pilots. His Stunt video series also has good information on building including carving wing tips, Building straight wings........ Bob has a website that can give you details.
3. Al Rabe has a series of tapes on the construction of his molded Semi-scale masterpieces. Good information on use of jigs for alignment and building in strength with structure.
All these gentlemen advertise in stunt news.