Creating new vehicles like the O-Yeah or the ZRT Special

How would I go about this? I see the author of that mod made a tutorial back in the day, but that was on the official forums, and they're long dead. I've tried copying the Tornado files, changing the internal name of the vehicle, and crunching the files, but the game just crashes before getting to the main menu. Any help would be appreciated.
 
I would love it if someone could post some of these new vehicles to see what they look like.
They're not exactly new vehicles. They're simply duplicates of other vehicles already present in the unmodded game, with different names and values for acceleration, handling, and the like. Both of the vehicles I mentioned are included in Gentlemen of the Row, you buy them at the Volition Gift Shop in the Museum District, I think they're $500,000 each.
 
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