Lee, I have one of Don's EVO 5 so maybe I can help. You can see mine in my gallery. EVO 5 is a bird cage frame much like the originals, FFR and many others. The body is just a skin over the frame with panels for the fire wall, foot boxes, trunk etc. The frame is the stength of the car as well as the protection.
The EVO6 is a ladder frame which is flat with main stringers to handle the motor much like stringers in a boat. The fibre glass body has the cockpit moulded in as well as the trunk, firewall etc. and sits on the ladder frame. The body is where all the strength is.
Don can explain the difference in the body thickness of the glass etc. I for one have this psychological thing about having steel around me.
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