S 720 is a really good looking rc plane, I was smitten by it when I saw it for the first time on the internet.
I tried copying the design and building one for myself. As the name suggests its an rc plane with 720 mm wing span. I have used XPS (extruded polystyrene) also called isufoam to built this rc plane. I am attaching the pics of the real model and also my copy of the design along with the initial stages of build with this post.

Some more pics. Did hot wiring for the horizontal and vertical stabilizers. and a lot of sanding on the wing and the fuselage