I think we could get away with adding Alpha circa
92' - after all it was STILL DEC at that point.
The way to get away with it would be to show real relevance. I don't
consider Alphas to be "vintage" in the least, but showing full
interoperability between related machines that evolved along a family
line going back more than thirty years is, in my view, a highl relevant
exhibit.
Further, keep in mind that a lot of this is marketing. It's marketing
for the museum, and for our "hobby" (using the term very loosely). An
exhibit as massive as the one we've got in mind will deeply impress a
lot of people.
... and it may deeply depress the local power grid. ;)