My fixture is made square and all the measurements are the same side to side and front to back. The stands have a specific location and are made of heavy steel as is the fixture.
We just put a complete driving Demon on our fixture and found the left rear rail was high. Yes you are correct the car was built that way. We caught the problem on the fixture. frame and rear cross support was not spot welded at the correct location from the factory. If a car is not square the dowels wont set in the holes made for them in every rail built.
Once the care sets in the dowels everything can be measured off the table with a plumb bob or a frame gauge. You would not believe how many cars the leaf spring mounts are not in the correct location. Then shops mini tub the car going off the spring mounts. We used a new never used left over Duster race car body in white shell to build the fixture. Its perfect square and level to the car. When the fixture is level so is the car .
If you notice in the last two pictures the front and rear of the car the stand also has double braces to tie the car down by the bumper mounting. . If the car doesn't set in place they will not fit. You cannot build a crooked car on this stand.
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