It seems tragic that so much work has disappeared with a trace. I have been reading Burnet’s notes to Euthyphro/Apology/Crito, and am learning a lot. I am also seeing about getting a copy of his notes to Phaedro and the Platonic Scholia. The lexicon would have been impressive, I’m sure. Maybe the slips will turn up in an attic somewhere someday.
Still, looking at all of the mechanical work involved, this sort of lexicon work should be so much easier in this day and age. I’ve thought a little bit about what a digital dictionary project would look like. There are some neat things that you could do as far as presentation, if you were just thinking about a wikipedia-style spruce up of the LSJ, for example. Or something could be done with NLP-style context-tagging, if one were trying to produce a next-generation sort of lexicon.