Here is what I've been trying. #10 was when I was thinking in CAD units. #12 is using the logic I mentioned in the above post. Also check out this paper. It took me a couple times to read it before I started to grasp the concepts.
http://archcomb.itc.pw.edu.pl/downloads/46_2010.pdf
E35A_0010.ctz
E35A_0012.ctz