Ok, let me please make a confession. I'm the same one who started this thread, and i forgot my password and lost the linked email address so i had to make a new one.
After adquiring some experience with FD scale by repainting, and in some cases, drawing from almost scratch, i decided to retake this project and after making some changes here and there and reviewing the style rules, with the help of the comments posted here, i hope it to be ok now:
Here it is:
BTW, i hope there's not a problem for resurrecting this thread.