So, right now I'll probably be working from LIV, Lubotsky's Indo-Aryan lexicon, that Mallory and Adams book that I have, some Beekes, and possibly also Masatovic's Celtic etymological dictionary (which I'm pretty sure I also have).

Unfortunately, this does mean developing a lexicographic ontology, but I'm confident that I have enough experience for this. Basically, I'll start by putting thins in spreadsheets with the semantic data schema in mind, and then transform it to RDF.

Fortunately, Lubotsky's work is already tabular, and I spend a shit-ton of time on M&A so it really just needs page references. LIV is gonna be a lot of work though.