Sorry, not to draw too fine a point, however...
As with the Lepontii and Euganei, neither the Raetians nor Ligurians were Italic people. As well it doesn't appear they were Celt and I don't even think they were IEs, although there may have been an IE aspect, of some kind. If one wants to go the IE route with them that brings us round to the Centum, and I may have to go there at some point, but not yet.
Again, most likely not Celt. I can provide one link between the Polish (Baltic) and Italian (Adriatic) Veneti. Amber...
If... and that’s a big if; the Veneti people were IE, and if the three major groups were related, then they most likely were an aspect of the LBA Urnfield expression? As with the proto-Celts, -Italics, -Illyrian, -western Balts, and others; this period witnessed the geographical jockeying that got each into their historic settings. However, the Celt ethnogenesis and following expansion occurred later in the EIA (euro). Also the archaeology of all thee Veneti groups do not fit well with the establish perimeters provided for continental Celtic culture.
CmacQ
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