"Both front corners were knocked off, all four wheels were wrecked and the tub was smashed in and twisted," said Esterer. "It was a mess."
The 48-year-old won the Lady Wigram Trophy race in Christchurch and is sitting fifth in the 2011/12 series points. Esterer reckons he won't know how competitive he can be until the car he is air-freighting down from Canada for the remaining rounds turns a wheel.
The replacement is another McRae GM1, one that he has owned for just over a year, though one he had not intended on pressing into service quite so soon.
"It's number 10, an ex-Quicksilver Racing team car raced by ... Rodney Green in 1975, then stored in his garage until 2006 when it was sold to Paul Hoey, then James Stengel who I bought it off," said Esterer.
Though Stengel raced the car in the United States in 2008, Esterer has only had time to strip and reassemble it, then break it down again to fit into the two air-freight boxes he used to transport his damaged model back to Canada late last year.
"It'll be completely untested. That's why I don't want to make too many predictions about this weekend. I'll collect the boxes from the air-freight depot when I get to Auckland on Wednesday, then spend Thursday and Friday putting it back together at the track. After that we'll just have to see."
Despite a couple of last-minute withdrawals (including local drivers Calven Bonney and Poul Christie), there will be 27 cars on the grid and as many as 30 at the second festival meeting the weekend after.
American Eric Haga will arrive to race in New Zealand for the first time and, like Kiwi veteran racer Kenny Smith, is one of the F5000 category's originals, having raced Formula 5000 single-seaters in the US first time around in the early 1970s.
Action started yesterday with practice and qualifying, with racing across nine different classic and historic categories scheduled for today and tomorrow. Racing begins at 9.00am both days.