Interesting approach, and nice work. I did something similar a few years ago to generate dashboard screens for a digital signage product. I used svg templates I

Interesting approach, and nice work. I did something similar a few years ago to generate dashboard screens for a digital signage product. I used svg templates I'd initially create in Inkscape, and erubis to handle XML valid embedded ruby. Inkscape has an amazing command line that handled converting the resulting SVG document into PNG or PDF. I liked the idea of using regular HTML and CSS, but pre-phantomjs the closest I could come was princeXML, and even then it lacked js support and the licensing costs were pretty high.