How do you resize a quilt pattern?

  I was commissioned to make a quilt for my friend that she found in a quilt magazine. Of course, don't you know that the pattern was much smaller than what she would need for her queen bed with quite a long drop. The pattern was for a small throw.
  I nervously took on the challenge of resizing the original pattern. Would have been great if I could of just doubled the original dimensions, but oh no. That was not going to work since her bed was larger than half by about 20 %.   I also must say that math skills do not run in my genetic pool, except perhaps down hill.
 To even increase the challenge, the quilt would be slanted on the cut so there were no vertical or horizontal lines. Oh boy!  Last I want to say, that while I certainly have plenty of fabric as a fabric dealer; I did not to waste for the sake of my friend's budget.
  So let me show you the final results and see what you think.  By the way, there was very little waste.