I completed the encoding of the text today -- the actual edition text is very simple. I've devised an encoding strategy for parallel texts (very simple -- just @type values for <div0> and <div1> elements), and I've written the XSLT and CSS required to render a side-by-side XHTML version that works pretty well. The results are up for proofing, and I've let the others know.

Meanwhile, the problem of PDF rendering on facing pages is daunting. I confess I can't (yet) imagine how it might be done, short of manually crafting each individual page, which is not practical. I'm going to post some questions to people who might know better.