A way to make a strong, light, insulated door for a custom application 

How to laminate a quick and dirty R-3 stressed skin insulated panel door.
I needed a pair of carriage doors for a garage. They needed to be strong enough to create an airtight seal, be insulated, lightweight, inexpensive.
BTW I couldn't find any custom manufacturer of carriage doors anywhere at any price.
I also asked for expert advice just in case this had been done before:
www.greenbuildi...