I should have put the following comment in a different blog post (I'm reading these 2-3 years late and I apologize for that).

Different font renderings for different sizes, instead of simply scaling one rendering, is a fantastic idea.

My late comment is, I don't like having the very last line of a score fully justified. If there are one or two short measures on the last line it need not be stretched out across the full width of the page. I hate that! Also, if a measure cannot fit on a line, it should be easy for the line to break without there necessarily being a bar line at the end of the physical score line so that the measure can continue on to the next line.