depends on the alloy material as to how it reacts and how similar it is to a plastic moulding, as really with the alloy chassis you are assessing fit and finish and layout, as the stiffness will be there, but you also have to take into consideration the extra bracing/work a composite tub would also need. If this has been done, there should be very little or no difference at all.
The only downside is that if they haven't done their homework, then the chassis will be as floppy as a cheap wig in the breeze.
I just hope the production lives up to the prototypes ability.
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