Chassis dimensions
 

Does anyone have good accurate chassis dimension drawings?

What are you looking for in particular?

There is a separate supplement to the factory shop manual that has a comprehensive set of dimensions for the body/chassis and subframes. When I had my project Miata on a surface plate doing some work I found there is very little deviation from spec. In most places within plus or minus one mm. In contrast, on a lot of cars 1/8" is close and some things may be off 1/2" or more.

That's the difference between American cars and Japanese cars.