Quite curious about the scale length of the Classico as well, since I seem to be generally headed in the EUB direction. I always assumed it was something close to a standard used for double-bass, if for no reason other than ease of string selection.
I am also curious about the afterlength... the Classico tailpiece is custom-made for the smaller stature of the body, and it must account for the proportion somehow. I don't think it would make nearly as much difference on an electric upright, where a resonant soundbox isn't in play, for mostly the same reason; you're amplifying the strings between the witness point of the bridge and nut, or wherever you note the string. If anything, that short run might produce a harmonic that got picked up, especially when bowing a section. If it was a problem, you'd have to decide whether to put a weighted suppressor on it. Guaranteed it happens a LOT less than on an upright. Everything on those things want to hum at some frequency.