The Lola B01/60's were over the 675Kg weight even early on, and gained weight with development, some of which was developing away from some of the innovations of the original concept (the startanator, or whatever it was called). The DBA was even farther above 675Kg.
Admittedly that was a decade and a half ago near enough, so perhaps more modern tech could save weight? Still, you need substance in structure and systems to run endurance races, and that means weight, or substantial expense to buy lightness.
Me just chewin fat...
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