I found that if you scale the drawing in the x-axis and compare to the known numbers its OK, if you compare the known numbers to scale measurements in the y-axis (up and down) they are proportionately off. I had to take some given numbers and apply a scale factor to get them right. As you know you have to be pretty comfortable with these numbers as it decides body height to chassis etc. Changes to CR blueprints, good heavens these are CAD drawings they MUST be accurate, even if they are missing a few subtle details like dimensions
