It is the brevity of the document
that gives you weirdies like the Second Amendment that is interpreted so many ways by so many different people. You have the Eigth Amendment and yet you have capital punishment, waterboarding, Gitmo and the largest prison population in the World. Certainly, it's flexible if the scope for (mis)interpretation is added in with Judicial Reviews to change the meaning every so often.
The Eighteenth and the Twenty-First were fun, eh? The Land Of The (Alcohol) Free.
Still, whatever suits you.
Lucky you could get your Civil Rights Act through without a Constitutional Amendment else they'd still be at the back of the bus.