My fourth foil is a small 1.9m². The AR is 3.8 and was made with Rhino. It has trailing edge and leading edge skin tensionning. The profile is a thick Jojo RS derived profile (17.5% at 21%). It's twisted, and is very stable, very powerful and controlable. It requires lots of wind to pull, but can fly in really lignt winds (without beeing overpowered...). The three last cells are closed, with valves, so it take a few seconds to fill and take offs are very smooth.
Just to mention, it was build with the fabric of my ugly 4.0m².