I hope you discovered some useful information in the OnLine Clinic for the Foamcore/Veneer method of structure building.  The key point is that the method allows separation of structural strength and outward appearance. Foamcore supplements, it does not replace, the variety of other materials used for structure building.  I hope you will give it a try.  If you have any questions you can send an email to email address removed.                            Ken Spranza, HORAILROAD.COM