Hi Al,
APM stands for artist perspective modeling, it's used by a number of artist including Russel Smith. The model in it's original form is accurate, it's my rendering of it that is out in some places. I just need to double check and let other people have a look before committing to canvas.
Despite the issues with the Pup drawing I'm delighted with it, it isn't so much the actual drawing of it but the fact I have a system that I am able to use to draw virtualy any aircraft in any position. I'm a very slow learner with anything mathmatical, it has taken me months to figure out how to use it
but I should get better as time goes on.
Cheers Terry
PS this will tell you more about the APM
aviart aviation art perspective