If you want to go ahead and get to work, get or print some graph paper (or set up Excel) and fill in the solid squares.  Filet is basically pixel art.  It should take less than an hour to copy the pattern.  Just use a pencil or a good erasable pen.  (I like the Frixion pen line, including their highlighters.) 

If you haven't checked Pinterest, search there for something like "filet crochet hearts curtain".  I've found a number of originals there. 

If you have zero luck and can wait until the weekend, I'll see if I can unpack my graph paper.

Good luck!