Not every one is talented in carving tree carcass.  The plates, neck and scroll could be “hydroformed” using a hydraulic press, form molds and a piece of hefty silicone rubber. The bass bar could be formed as part of the front plate.  Looks like it utilizes a standard sound post.  Some sort of a grommets would be needed for the pegs.

Assembly would require the utilization of a tig welder.

Now I am going to cruise down country roads to abscond with a traffic sign or two for raw materials.  What a wonderful idea for rental quality instruments.

I found a little more info on the aluminum violin.  The corpus was hydroformed in two sections (top and bottom) and welded at the mid point of the rib.  The neck was stiffened with a wooden insert.  Rubber grommets were used to lessen wear on tuning pegs.  A wood appearing appliqué was applied over the aluminum.