As I think about what you are doing you might be onto something really good for a low cost aircraft. If you take a sample of every sheet of material you use and catalog the result you can have confidence that the manufacturer did not change the materials. Do some some tests to destruction of some joints. You can test the material and glues to see what time and environment do to them. I am thinking of leaving some samples outside like Strojnik and Rutan have done. Rutan had a composite Variviggen wing outdoors that was used as a picnic table. Load test the airframe after construction and then do a detailed inspection. Even when the aircraft is completed a geodetic airframe will allow you access to the inside of the fuselage for inspection. While this sounds difficult I don't think it is more labor and inspection intensive than composite. Geodetic spreads the loads out so much you probably won't have many highly loaded members. Please keep us informed!!