I'm no chassis designer, but I wonder how stiff the frame will be in twist relative front to rear? The center structure looks fairly weak with no diagonals, it has two squareish tubes on the bottom and two round tubes across the top. Perhaps they anticipate the body to take the twisting load.
My bet is that the chassis is made of steel, only because it's welded to the weld table.
Also, I believe that inboard shocks don't reduce the unsprung weight, because if it moves with the wheel, it's unsprung. You're adding the mass of the pivot plus the links involved connecting the wheels to the shock.
John
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