The question remains though - underneath all of the non-correct bits, is there any semblance of a real car? The auction details provide no 'precision', so it's still difficult to know.
The non-correct bits do seem to dominate. For context, attached is a picture with original bits!
The chassis number I was alerted to is easily checkable at Gaydon... but didn't seem to fit any of the (long identified) ranges of Sports and Supersports models in the B3 ledger.
As Jon says, the chassis 130963 is within the range held in the Gaydon records; my personal records show no Ulsters recorded between 130188 (a supercharged chassis without engine transferred to the Competitions Department) and 132076 (an un-supercharged black & red car sold 31/3/31).
The pictures from 2018 show what looks like a well put together car (at that point) and a Cozette blown replica is still an unusual and potentially interesting thing. Almost impossible to take a sensible view on it from the auction particulars though. Oh well!