I have started to build the ama hulls with polyurethane 10mm sheets. It was easy work with but felt very fragile. In class we got a really good diagram what core material is good and what’s not. You can clearly see that I have used wrong core. To not spend more time and money to build a breaking structure I have ordered 20m2 divinycell H60 15mm and will start over with that 🙂
Chryz10 