@bhaskaradari8: you can use several materials for building a hovercraft.
I used depron foam for the model you see above.
you can have balsa, high density thermocol, plastics and many other materials for building it.
@utkarshg13: thanks...
I had modified the same craft to get a bag skirt and ran it over land....
the new design was a double hull design and well got damaged as I took it home during vacations.
anyways got it up and running but had to use a lot of stuff lying around...
here are a few pics from my second design
hope you like it...