I was going to ask what the ratio is of the original 2D layout resolution vs the 3D spacial resolution of, for instance, the forward corners of the rear wheelwells. Are they within 1/10th or 1/4" of where they should be? Less than 1/10th" in the original layout?
That's one big opening. Is the rear bulkhead going to be a ginormously stiff U-shape?
And what did you think about foamed aluminum for the suspension attachment points? At the link they quote $2 to $500/lb for finished parts, so the first number is probably close to raw material cost.