You make a big assumption when you say it's an honest car, well other than it honestly being a car. I also suspect if you phone up Mr Suhail he won't have a fully documented (with stage based photographic evidence) of it's high quality rebuild from a company who specialise in rebuilding BMW M cars, so knows all the correct numbers for the suspension, chassis and other such things. A crabbing M3 with 180k on the clock is still a dog even if it's 6K and whilst it might be a fully reshelled rebuild, built up from scratch I somehow suspect not...
at £20k worth of damage, id expect the car to have been barely recognisable at the time
