Great project and great fun to build. RipStop Nylon was used for the skirt. I cut a piece oversize and attatched to the bottom of the hovercraft before cutting out the centre section. I printed out the DXF file and cut it out. Make a cut in the template to allow it go over the hull, mark the outline with a chinagraph pencil then cut the skirt to shape.
I will post another video when I get a new battery pack.
https://www.youtube.com/watch?v=Vv9HMk8b514