How to check fairness of lines drawing or say posts drawing

Ok , we have design drawings of posts as seen as at below welsford design. Is there a simple way to check and correct fairness of posts drawings ? I read somewhere to draw a line on to posts drawings and check from there but I am not sure whether I could understand with very short description. Can you help me ?

 

The correct thing, from my point of view, would be to draw the body lines plan, for example in AutoCAD, and correct/check everything necessary.
It is not possible to explain it in a few words but I can do it and send you the drawing in Autocad. This way you will see how to do it. I must tell you that you need to have some experience in both drawing and fairing.
Send me a PM if you want.

 

PM Sent. Thank you very much.