The Moffat 69 Mustang has most of those cheats, and the nose is obviuosly drooped, about1 1/2 " I beleive. It has convertible sill panels which are stiffer and much more . And that was an official Ford car.
The EB V8 Supercars all had cheater light weight shells, guards, bonnets etc so nothing is new.
I was led to believe that the Moffat nose droop was in the vicinity of 2"... apparently the Trans-Am cars were made to partially restore (circa 1") of the cut that made this possible, but the Moffat car was here already... there was a LOT of work put into those Mustangs...
The EF Falcons were where the can of worms got opened iirc, but the EB would certainly have been lightened before them.
I recall that a certain "Rock star" car, built out of an old road car, had been acid-dipped to the point that the roof panel warped and had to be bogged up... its builder maintains that the dipping was done solely with a view to cleaning the body deadener and crud from the shell in the shortest time possible... but he has also gone on record as saying that the ridiculously low homologated weight for that vehicle was something that he viewed as significant in selecting and building the car... hotably, it was arguably the only vehicle of that particular type (that, and its successor), which made it anywhere near the homologated weight, with other examples carrying anything up to several hundred more kilos of lard... said team, in a later and equally successful iteration, apparently (according to fable, inuendo and general hearsay) utilised a marvellous ABS system which was built around a set of hydraulic proportioning valves and a pendulum actuator, which used the mass and movement of the pendulum under the effect of the car's inertia to proportion brake bias to the most heavily-weighted corner.... until it was found...
and I also enjoyed the Harry Firth story of how he applied the numbers crooked on one Bathurst car, so that people were looking intently at the sloppy signwriting, rather than scrutinising some of the other "finishing touches"...